El viento perdió fuerza.

Perdió is the pretérito indefinido (the simple past), from the verb perder.

It is used here because the sentence presents the wind’s loss of strength as a completed event or change:

• El viento perdió fuerza. = the wind lost strength / the wind weakened.

A learner often compares it with perdía:

• perdió = it lost strength, as a completed change
• perdía = it was losing strength / used to lose strength, more ongoing or descriptive

So in this sentence, perdió sounds natural because it marks a specific change.

The accent in perdió shows the stress falls on the last syllable: per-DIÓ.

It is also useful because it distinguishes the pronunciation clearly in the past tense form. This is the 3rd person singular form of perder in the preterite:

• yo perdí
• tú perdiste
• él/ella/usted perdió

Without the accent, it would not follow the correct spelling and stress pattern for this form.

In Spanish, nouns usually need an article more often than in English. So when speaking about the wind in a general or specific sense, Spanish normally says:

• el viento

Using viento without an article would usually sound incomplete in a normal statement like this.

Compare:

• Hace viento. = It’s windy.
  Here viento appears without an article because it is part of a fixed weather expression.
• El viento perdió fuerza. = The wind lost strength.
  Here viento is the subject of the sentence, so el is natural.

In the expression perder fuerza, Spanish usually does not use an article. Here, fuerza means strength in a general, uncountable sense.

So:

• perder fuerza = to lose strength
• ganar fuerza = to gain strength
• cobrar fuerza = to gather strength

Using la fuerza would usually make it sound more specific, as if you were referring to a particular strength already identified in context.

So El viento perdió fuerza is the normal, idiomatic way to say it.

Yes. Perder fuerza is a very common expression. It is used not only for wind, but for many things that become weaker, less intense, or less effective.

Examples:

• La tormenta perdió fuerza. = The storm lost strength.
• El movimiento perdió fuerza. = The movement lost momentum.
• Su voz perdió fuerza. = His/Her voice lost strength.

So this is a very useful pattern to learn.

Yes, absolutely. Even if the meaning has already been given, this is a good grammar question because it helps you understand how Spanish and English express the same idea differently.

Spanish says:

• El viento perdió fuerza.

A very natural English translation is:

• The wind weakened.

Spanish often uses a verb + noun structure where English might prefer a single verb:

• perder fuerza = to weaken / to lose strength
• tener miedo = to be afraid
• dar un paseo = to take a walk

So the Spanish is literal, but the most natural English may be slightly different.

The subject is El viento.

The verb is perdió.

Fuerza is the direct object of the verb perder. It is the thing that was lost.

So the structure is:

• El viento = subject
• perdió = verb
• fuerza = direct object

This is a straightforward sentence pattern in Spanish.

Yes, El viento se debilitó is grammatical and means something very close to The wind weakened.

However, there is a slight difference in feel:

• El viento perdió fuerza = very common, neutral, idiomatic
• El viento se debilitó = also correct, a bit more formal or descriptive in some contexts

In weather reports, both can work, but perder fuerza is especially common.

You may also hear:

• El viento amainó. = The wind died down / eased off.

That is another very natural weather verb.

Here fuerza is singular because it means strength as an abstract quality.

• perder fuerza = to lose strength

Using fuerzas would usually mean strengths, powers, or sometimes energy/physical strength in other contexts, and it would not be natural in this sentence.

So for wind, storms, arguments, movements, etc., the normal expression is:

• perder fuerza
• not perder fuerzas

A broad Spain pronunciation would be approximately:

el BYEN-to per-DYÓ FWER-tha

A few key points:

• viento: the ie is like ye in one syllable: byen-
• perdió: stress on the last syllable: per-DYÓ
• fuerza: in most of Spain, z is pronounced like the th in think, so fuer-tha

A more phonetic guide:

• El viento → el byen-to
• perdió → per-dyó
• fuerza → fwer-tha (in most of Spain)

In Latin America, fuerza would usually sound more like fwer-sa.

The normal, neutral order is:

• El viento perdió fuerza.

Spanish does allow some flexibility, but changing the order usually changes the emphasis.

For example:

• Perdió fuerza el viento.

This is possible, but it sounds more marked or literary, or as if you are highlighting what happened before naming the subject.

For everyday speech and most writing, El viento perdió fuerza is the best choice.