Dünkü rüzgâr yüzünden kapının sürgüsü biraz gevşemiş.

Dünkü means yesterday’s or the one from yesterday.

It is formed from:

• dün = yesterday
• -kü / -ki = a suffix that turns a time or place expression into something like an adjective

So:

• dün → dünkü = yesterday’s

In this sentence, dünkü rüzgâr means the wind from yesterday / yesterday’s wind.

This -ki/-kü suffix is very common:

• bugünkü haber = today’s news
• yarınki toplantı = tomorrow’s meeting
• evdeki kitap = the book in the house

Because of vowel harmony, it appears here as -kü.

Yüzünden means because of, due to, or sometimes as a result of.

So:

• dünkü rüzgâr yüzünden = because of yesterday’s wind

This is a very common Turkish structure for giving a cause.

Examples:

• Yağmur yüzünden geç kaldım. = I was late because of the rain.
• Trafik yüzünden eve geç geldik. = We got home late because of traffic.

A useful nuance: yüzünden can sometimes sound slightly negative, like the cause led to a problem or unwanted result. That fits this sentence well, because the wind caused the bolt to loosen.

Kapının sürgüsü is a genitive + possessed structure, often called an izafet construction.

It breaks down like this:

• kapı = door
• kapının = of the door
• sürgü = bolt, latch, slide-bolt
• sürgüsü = its bolt / the bolt

So:

• kapının sürgüsü = the door’s bolt / the bolt of the door

Turkish often uses this pattern:

• first noun gets -ın / -in / -un / -ün
• second noun gets a possessive ending

Other examples:

• evin kapısı = the door of the house
• arabanın rengi = the color of the car
• masanın ayağı = the leg of the table

You may also see noun compounds like kapı kolu = door handle. But here, kapının sürgüsü sounds like a more specific the bolt of the door.

This is because the second noun in the noun-possessive construction takes the third-person possessive suffix.

• sürgü = bolt
• sürgü + -(s)ü = sürgüsü = its bolt / the bolt

The s appears as a buffer consonant because the word ends in a vowel.

Compare:

• kapı → kapısı
• araba → arabası
• renk → rengi
• kitap → kitabı

So in kapının sürgüsü, the full idea is literally something like:

• of the door, its bolt

That is standard Turkish grammar.

In this sentence, sürgü means a door bolt, latch, or sliding bolt—the piece of hardware used to fasten a door.

It does not mean exile here, even though sürgün and related words can have other meanings in Turkish. In this context, with kapının before it, sürgü clearly refers to the physical bolt on a door.

So:

• kapının sürgüsü = the door bolt / the latch on the door

Biraz means a little, a bit, or somewhat.

So:

• biraz gevşemiş = has loosened a bit / seems to have loosened somewhat

It softens the statement and tells you the change is not extreme.

Examples:

• Biraz yorgunum. = I’m a little tired.
• Kapı biraz açık. = The door is a little open.
• Bu vida biraz gevşemiş. = This screw has loosened a bit.

The base form is gevşemek, which means to loosen, to become loose, or to slacken.

So:

• gevşe- = become loose
• gevşemiş = has apparently become loose / seems to have loosened / has loosened

This verb is intransitive here: the bolt itself became loose.

Compare:

• gevşetmek = to loosen something
• gevşemek = to become loose

So:

• Kapının sürgüsü gevşemiş. = The door bolt has loosened.
• Kapının sürgüsünü gevşetmiş. = He/she has loosened the door bolt.

That difference is important.

This is one of the most important questions in Turkish grammar.

-miş often gives a meaning like:

• the speaker learned this afterward
• the speaker is inferring it from evidence
• the speaker is reporting it rather than directly witnessing it

So gevşemiş can suggest:

• It seems the bolt has loosened
• Apparently the bolt loosened
• The bolt has loosened

By contrast, gevşedi is the straightforward past tense:

• It loosened
• It became loose

A rough contrast:

• Kapının sürgüsü gevşedi. = The door bolt loosened.
  Direct statement of past fact.
• Kapının sürgüsü gevşemiş. = The door bolt seems to have loosened / apparently it loosened.
  The speaker may be noticing it now or reporting what they found out.

In everyday Turkish, -miş is very common when someone notices a result and comments on it.

It does not match English tenses perfectly.

Depending on context, gevşemiş could be translated as:

• has loosened
• seems to have loosened
• apparently loosened
• turned out to be loose

So it often overlaps with the English present perfect, but the key Turkish idea is not really the tense alone. The important nuance is the -miş meaning: reported, inferred, or newly discovered information.

That is why translation depends on context.

Yes. Turkish word order is flexible, but this sentence uses a very natural neutral order:

• Dünkü rüzgâr yüzünden = because of yesterday’s wind
• kapının sürgüsü = the door’s bolt
• biraz gevşemiş = has loosened a bit / seems to have loosened a bit

A common pattern in Turkish is:

cause + subject + adverb + verb

So this sentence feels natural and clear.

You could rearrange parts for emphasis, for example:

• Kapının sürgüsü dünkü rüzgâr yüzünden biraz gevşemiş.
• Biraz gevşemiş kapının sürgüsü, dünkü rüzgâr yüzünden.
  This is much less neutral and more stylistic.

For learners, the original sentence is a very good standard model.

Yes, two things often catch learners’ attention:

• ü is a front rounded vowel, similar to German ü
• â in rüzgâr can indicate a longer vowel or affect pronunciation historically; in modern speech many speakers simply say it naturally as part of the word

You do not need to overthink the â at beginner level. The important thing is to recognize the word as rüzgâr = wind.

Also note that Turkish spelling is generally regular, so once you know the sounds, pronunciation is fairly predictable.

Yes, very possibly.

Because of gevşemiş, the sentence can sound like the speaker is noticing the result now and inferring the cause:

• The speaker sees the bolt is loose
• They think yesterday’s wind caused it

So the feeling may be something like:

• Looks like the door bolt has loosened a bit because of yesterday’s wind.

This kind of observation + inference is exactly where -miş is often used in Turkish.

Yes. A common alternative is nedeniyle, which also means because of / due to.

Compare:

• Dünkü rüzgâr yüzünden kapının sürgüsü biraz gevşemiş.
• Dünkü rüzgâr nedeniyle kapının sürgüsü biraz gevşemiş.

Both are correct, but there is a slight difference in feel:

• yüzünden = more everyday, often with a negative result
• nedeniyle = more formal or neutral

In this sentence, yüzünden sounds very natural.

A word-by-word breakdown looks like this:

• Dünkü = yesterday’s
• rüzgâr = wind
• yüzünden = because of
• kapının = of the door
• sürgüsü = its bolt / the bolt
• biraz = a little
• gevşemiş = has apparently loosened / seems to have become loose

So the literal structure is something like:

Because of yesterday’s wind, the door’s bolt has apparently loosened a little.

That is a very typical Turkish sentence structure: cause first, then the thing affected, then the result at the end.