Accusative with Compound Verbs | Latin Grammar

Some Latin verbs formed with a prepositional prefix take a bare accusative even though their simple verb is intransitive. Thus trāns flūmen īre means “go across the river,” with separate trāns + accusative, while flūmen trānsīre means “cross the river,” with the prefix incorporated into the verb. The important fact is lexical: the whole compound verb licenses its accusative.

From a spatial relation to a transitive verb

Prefixes such as ad-, circum-, in-, ob-, per-, praeter-, sub-, and trāns- can turn a path or goal into part of the verb's meaning. This is especially clear in compounds of eō, īre “go”:

Legātī Caesarem adeunt ut dē obsidibus agant.

The envoys approach Caesar to negotiate about the hostages.

Exercitus flūmen trānsiit ante sōlis occāsum.

The army crossed the river before sunset.

In Caesarem adeunt, the accusative names the person approached, consulted, or visited. In flūmen trānsiit, it names the barrier or space crossed. Neither noun follows a free-standing preposition: ad- and trāns- are now parts of adeunt and trānsiit.

Compare two ways of organizing nearly the same scene:

Viātōrēs trāns flūmen eunt.

The travellers go across the river.

Viātōrēs flūmen trānseunt.

The travellers cross the river.

The first has the phrase trāns flūmen modifying eunt. The second has transitive trānseunt governing flūmen. English also alternates between a path phrase (“go across”) and a transitive verb (“cross”), but it does not predict which Latin compounds are established as transitive.

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Do not mentally detach every prefix and treat it as a preposition governing the noun. Identify the dictionary verb first—trānseō, not merely eō—and learn its construction together with its meaning.

The most important patterns

The following groups are frequent in Classical prose and verse. Meanings have often moved beyond literal space.

Compound	Accusative role	Typical combination
adeō, adīre	person, place, or deliberative body approached or consulted	Caesarem adīre “approach Caesar”
circumeō, circumīre	place or object gone around	mūrōs circumīre “go around the walls”
ineō, inīre	undertaking, plan, agreement, or office entered	consilium inīre “adopt a plan”
obeō, obīre	duty, office, death, or region encountered/traversed	mūnus obīre “perform a duty”
praetereō, praeterīre	person or thing passed by	portam praeterīre “pass the gate”
subeō, subīre	danger, burden, duty, or position gone under/undertaken	perīculum subīre “face danger”
trānseō, trānsīre	boundary, space, or obstacle crossed	flūmen trānsīre “cross a river”
ingredior, ingredī	road, course, or place entered	iter ingredī “enter upon a journey”

Viātor portam praeteriit neque in urbem intrāvit.

The traveller passed the gate and did not enter the city.

Dux mūrōs circumīvit antequam impetum fēcit.

The commander went around the walls before making an attack.

Adulēscentēs post longam disputātiōnem novum consilium iniērunt.

After a long discussion, the young men adopted a new plan.

The last example shows semantic extension. No one physically goes inside a “plan”; consilium inīre is an established (formal) prose expression for resolving upon or adopting a plan. Similarly, duties and dangers can be conceptualized as paths one enters or meets.

Cōnsul summum perīculum subiit nē sociōs dēsereret.

The consul faced extreme danger rather than abandon the allies.

Magistrātum obīre nōn honor modo sed etiam onus est.

Holding public office is not only an honor but also a burden.

These metaphorical uses are common in (formal) political, military, and historical prose. They are not poetic exceptions, although poetry naturally exploits them too.

Why the prefix does not provide an automatic rule

Latin compounds differ in case government. Some take an accusative because the compound is transitive; many others take a dative, retain a prepositional phrase, or occur without any object. Compare:

Legātī Caesarem adeunt, sed mīlitēs ducī pārent.

The envoys approach Caesar, but the soldiers obey their commander.

Adeō takes the accusative Caesarem. Pāreō takes the dative ducī. The endings cannot be predicted merely from the visible prefixes. The same warning applies to compounds associated with proximity or precedence:

Cōnsul exercituī praeest; hostēs autem castra circumstant.

The consul commands the army, while the enemy surround the camp.

Praesum governs dative exercituī, whereas transitive circumstō can govern accusative castra. See dative with compound verbs for the competing pattern.

There is no reliable shortcut here. Learn aliquem adīre, aliquid trānsīre, alicui praeesse, and alicui pārēre as complete lexical frames. A dictionary's examples and case labels are part of the verb entry, not optional detail.

Literal, extended, and double constructions

A compound may allow both a bare accusative and a separate prepositional phrase, with a difference in construal. Ad Caesarem īre simply reports motion toward Caesar; Caesarem adīre often means to approach him for an audience, appeal, consultation, or formal business. Likewise, trāns flūmen īre describes a route, whereas flūmen trānsīre presents the river as the object crossed.

Some already-transitive compounds can occur with another phrase, but that does not license two arbitrary accusatives. In exercitum Rhēnum trādūcere “lead the army across the Rhine,” exercitum is the person or body led and Rhēnum is the space crossed. Such causative patterns must be learned with the verb; they are not a general rule for every prefixed verb.

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When two accusatives occur, test each relation separately. Ask what is acted upon, what path or boundary is traversed, and whether the dictionary construction actually licenses both. Word order does not assign the roles.

Parsing diagnostic

When a bare accusative stands near a prefixed verb:

Recover the full dictionary headword and meaning.
Check whether that compound is attested as transitive.
Ask whether the accusative is the person approached, the thing passed, the space traversed, or a lexicalized undertaking.
Rule out another accusative function such as duration, distance, or infinitival subject.
Translate the whole predicate naturally; do not assign the prefix one fixed English preposition.

This construction is productive only within established lexical families. Later Latin can expand or rearrange prepositional patterns, and (literary) authors can imitate Greek or compress syntax, but an A2 learner should follow ordinary Classical government rather than manufacture new compounds.

Common Mistakes

1. Repeating a prefix as a free preposition

❌ Exercitus flūmen īvit.

Incorrect for 'the army crossed the river': simple īre does not license flūmen as a bare object.

✅ Exercitus flūmen trānsiit.

The army crossed the river.

2. Giving every compound a dative

❌ Legātī Caesarī adiērunt.

Incorrect with transitive adīre meaning 'approach or consult'; the person approached is accusative.

✅ Legātī Caesarem adiērunt.

The envoys approached Caesar.

3. Giving every compound an accusative

❌ Cōnsul exercitum praeest.

Incorrect: praeesse governs the dative in this meaning.

✅ Cōnsul exercituī praeest.

The consul commands the army.

4. Copying English word order instead of Latin government

❌ Perīculō cōnsul subiit.

Incorrect for 'the consul faced danger'; English gives no reason to choose the dative.

✅ Perīculum cōnsul subiit.

The consul faced danger.

Key Takeaways

The accusative with a compound verb is licensed by the compound as a lexical verb. It commonly marks a person approached, a boundary crossed, a place encircled, or an undertaking entered. Learn each compound with its case frame, distinguish a prefixed verb from a free preposition plus simple verb, and never infer accusative or dative from the prefix alone.

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