Mendacium timorem auget.

You know mainly from the case endings, not just from word order.

• mendacium is the subject: it is in the nominative singular
• timorem is the direct object: it is in the accusative singular
• auget is the verb: increases

So Latin marks the roles of the nouns with their endings. In English, we usually depend much more on word order.

That is a very common beginner question. The ending -um can mean different things depending on the noun’s declension and gender.

Here, mendacium is a 2nd-declension neuter noun. For neuter nouns in this declension:

• nominative singular = -um
• accusative singular = -um

So mendacium could be either nominative or accusative in form. In this sentence, it is the subject, so it is nominative.

This is a general neuter rule in Latin:

• neuter nominative and accusative are always the same

That is why context and sentence structure still matter.

timorem is the accusative singular form of timor, timoris, a 3rd-declension masculine noun meaning fear.

Its forms go like this:

• nominative singular: timor
• accusative singular: timorem

Because it is the direct object of auget, Latin puts it in the accusative.

So:

• timor = fear as a subject
• timorem = fear as a direct object

auget is the 3rd person singular present active indicative of augere, meaning to increase, to enlarge, or to make grow.

Breaking it down:

• verb: augere
• stem: auge-
• ending: -t = he/she/it in the present tense

So auget means:

• he increases
• she increases
• it increases

In this sentence, the subject is mendacium, which is it, so auget means it increases.

Because Latin word order is much more flexible than English word order.

A very common neutral Latin pattern is:

• subject – object – verb

So Mendacium timorem auget is perfectly normal.

English usually prefers:

• subject – verb – object
• A lie increases fear

Latin can move words around more freely because the endings show each word’s role. For example, all of these could mean the same basic thing:

• Mendacium timorem auget
• Timorem mendacium auget
• Auget mendacium timorem

The choice of order can change emphasis, but not necessarily the core meaning.

Latin does not have articles like English a, an, and the.

So mendacium can mean:

• a lie
• the lie
• sometimes just lie/falsehood in a general sense

And timorem can mean:

• fear
• the fear
• a fear, depending on context

You usually decide which English article to use from the context.

Here it is singular.

For mendacium:

• singular nominative: mendacium
• plural nominative: mendacia

So mendacium = a lie / a falsehood
and mendacia = lies / falsehoods

Because the verb is also singular, auget, that matches a singular subject.

The ending -t tells you that it is 3rd person singular.

Very broadly in the present tense:

• -o / -m = I
• -s = you (singular)
• -t = he/she/it
• -mus = we
• -tis = you (plural)
• -nt = they

So auget means he/she/it increases, not they increase.

If the subject were plural, you would expect augent.

Because timor is the nominative form, and this noun is not the subject here.

Compare:

• timor auget = fear increases
• mendacium timorem auget = a lie increases fear

In your sentence, fear is what receives the action of increasing, so Latin uses the accusative: timorem.

No, not in this form.

If fear were the subject, it would need to be timor, not timorem.
And if lie were the object, mendacium could look the same in form because it is neuter, but the sentence as written clearly marks timorem as the object.

So the grammar points to:

• mendacium = subject
• timorem = object

They belong to different declensions:

• mendacium, mendacii = 2nd declension neuter
• timor, timoris = 3rd declension masculine

That is why their case endings look different:

• mendacium has the neuter 2nd-declension -um
• timorem has the 3rd-declension accusative singular -em

Learning to recognize declensions helps a lot with identifying case and function.

It can be a little broader than just the everyday English noun lie.

Depending on context, mendacium can mean:

• a lie
• falsehood
• deception
• untruth

So the sentence can feel slightly more general or abstract than plain conversational English, depending on how it is being used.

A common reconstructed Classical pronunciation would be approximately:

men-DAH-kee-um ti-MO-rem OW-get

A few helpful points:

• c in mendacium is always hard, like k
• ti in timorem is just ti, not English sh
• au in auget sounds like the ow in cow
• g is always hard, like in go

So auget is not like English aw-jet; it is closer to ow-get.