La locura terminó ayer.

In Spanish, abstract nouns are often used with the definite article more than in English. So la locura literally means the madness / the craziness, but in natural English we may simply say madness or the madness, depending on context.

Here, la locura probably refers to a specific period or situation of chaos that both speaker and listener understand.

Locura is a noun meaning madness, insanity, or more loosely craziness / chaos, depending on context.

It can refer to:

• actual mental insanity
• wild or irrational behaviour
• a chaotic or crazy situation

So in this sentence, it could be literal or figurative. Very often, it is figurative.

Terminó is the preterite tense, which is used for a completed action in the past. It tells us the madness ended at a specific point.

Terminaba is the imperfect, which usually describes:

• ongoing past actions
• repeated past actions
• background description

So:

• La locura terminó ayer = The madness ended yesterday
• La locura terminaba... would sound incomplete by itself, as if you were setting a scene or describing something in progress

Because ayer gives a completed past time, the preterite terminó is the natural choice.

The accent mark shows where the stress goes: ter-mi-NÓ.

Without the accent, termino would be stressed differently and would mean I finish / I end in the present:

• termino = I finish
• terminó = he/she/it ended or you (formal) ended

So the accent is important because it changes both pronunciation and meaning.

The subject is la locura.

So terminó here means:

• it ended, if you translate literally
• or more naturally in English, the madness ended

The verb is in the third person singular because la locura is singular.

Spanish usually leaves out subject pronouns when they are not needed. The verb form and context normally make the subject clear.

So instead of saying:

• Ella terminó ayer

Spanish simply says:

• La locura terminó ayer

Even if the subject were already known, Spanish often omits pronouns unless they are needed for emphasis, contrast, or clarity.

Yes. Terminar can be:

• intransitive: to end
• transitive: to finish something

In your sentence, it is intransitive:

• La locura terminó ayer = The madness ended yesterday

But it can also be transitive:

• Terminé el trabajo = I finished the work

So the same verb can work in both ways, depending on whether there is a direct object.

Yes, ayer can move around.

The most neutral order here is:

• La locura terminó ayer

But you could also say:

• Ayer terminó la locura

Both are correct. The difference is mainly emphasis:

• La locura terminó ayer focuses first on the madness
• Ayer terminó la locura highlights yesterday

Spanish word order is often more flexible than English.

Yes. Acabó is a very natural alternative.

• La locura terminó ayer
• La locura acabó ayer

Both can mean The madness ended yesterday.

Very roughly:

• terminar often feels a bit more neutral
• acabar can sound slightly more like come to an end

In many contexts, they are interchangeable.

Yes, you may hear that too.

Se terminó can sound a little more colloquial or can add a sense of it came to an end. In many situations, it means almost the same as terminó.

So all of these are possible:

• La locura terminó ayer
• La locura se terminó ayer
• La locura acabó ayer

The first one is simple, standard, and completely natural.

A simple pronunciation guide is:

la lo-KU-ra ter-mi-NO a-YER

A more careful approximation:

• la
• lo-cu-ra
• ter-mi-nó
• a-yer

A few useful points:

• r in locura is a light tap, not a strong English r
• the stress in terminó is on the last syllable because of the accent mark
• ayer is stressed on yer

In standard Peninsular Spanish, y in ayer sounds like the English y in yes, though actual pronunciation can vary by speaker and region.

Yes, it is completely natural.

It is a short, clear sentence with:

• a subject: La locura
• a past-tense verb: terminó
• a time expression: ayer

It sounds normal in both written and spoken Spanish, especially if la locura refers to a specific chaotic event or situation already understood in context.