El ladrón corrió.

In Spanish, it is very common to use the definite article where English might also use the: el ladrón = the thief.

You could say just ladrón in some contexts, but as a complete sentence subject, el ladrón sounds natural if you mean a specific thief. Without the article, ladrón would usually sound incomplete here.

El is the masculine singular definite article, so yes, el ladrón normally refers to a male thief.

If you wanted to refer to a female thief, you would usually say la ladrona.

So:

• el ladrón = the male thief
• la ladrona = the female thief

The accent mark shows which syllable is stressed. Ladrón is stressed on the last syllable:

• la-DRÓN

Without the accent mark, Spanish pronunciation rules would make you stress it differently, so the accent is necessary.

It also helps when making the plural:

• el ladrón
• los ladrones

Notice the written accent disappears in the plural form.

A rough pronunciation for an English speaker is:

• lah-DRON

A few details:

• la is a short, clean vowel, not like English lahh drawn out.
• dr is pronounced together.
• ó is stressed.
• The final n is clear and light.

In Spain, the r is a tapped r, not the strong English r sound.

Corrió is the preterite form of correr and means ran in the sense of a completed action in the past.

So:

• corre = runs / is running
• corría = was running / used to run
• corrió = ran

In El ladrón corrió, the sentence presents the action as a finished event: The thief ran.

Corrió is third person singular preterite of correr.

That means it can mean:

• he ran
• she ran
• it ran
• you ran in formal singular (usted)

Here, because the subject is el ladrón, it means the thief ran.

The accent mark shows the stress falls on the final syllable:

• co-rri-Ó

This is important because Spanish verb forms often use accent marks to distinguish pronunciation and sometimes to help distinguish forms.

So corrió is pronounced differently from corrio, which would not be standard Spanish spelling.

Yes. Spanish often drops subject pronouns, and sometimes even noun subjects if the context is clear.

So Corrió can mean:

• He ran
• She ran
• It ran
• You ran (formal)

But if you want to make clear that it was the thief, then El ladrón corrió is more explicit.

Yes, Corrió el ladrón is also possible.

Both mean The thief ran, but the word order changes the feel slightly:

• El ladrón corrió = neutral, straightforward
• Corrió el ladrón = more literary, emphatic, or context-driven

Spanish allows more flexibility in word order than English.

The infinitive is correr, meaning to run.

A few forms are:

• correr = to run
• corre = he/she runs
• corrió = he/she ran
• corría = he/she was running / used to run

Ladrón is the standard, common word for thief.

It comes from the verb ladrar? No — despite how it looks, it is not related to that in modern learning terms. You should simply learn ladrón as the noun meaning thief.

Other words may exist in slang or specific contexts, but ladrón is the normal vocabulary word a learner should know.

You would change both the noun phrase and the verb:

• El ladrón corrió. = The thief ran.
• Los ladrones corrieron. = The thieves ran.

Notice:

• el → los
• ladrón → ladrones
• corrió → corrieron

Depending on context, yes. The basic meaning is ran, but in natural translation it can sometimes be understood as:

• ran
• ran off
• ran away
• hurried

Spanish often relies on context more than English for these shades of meaning. By itself, El ladrón corrió most directly means The thief ran.