Die Jalousie im Büro klemmt heute wieder.

In this sentence, die Jalousie means the blind or window blind.

Be careful: the German word is a very common everyday word for a blind, but English jalousie is not commonly used that way in modern everyday English. So when learning German, it is best to connect Jalousie with blind.

• die Jalousie = the blind
• plural: die Jalousien = the blinds

Jalousie is a feminine noun, so it takes die in the nominative singular:

• die Jalousie = the blind

Like many German nouns, its gender has to be learned as part of the word. It is best to memorize it together with the article:

• die Jalousie
• das Büro
• der Rollladen (another window-covering word, meaning shutter/roller blind)

Im Büro means in the office.

It is a contraction:

• in dem Büro → im Büro

This contraction is very common in German.

So:

• in dem = im
• in das = ins

Here, Büro is neuter (das Büro), and im Büro uses the dative because it describes a location, not movement.

Because this sentence describes where the blind is, not movement into the office.

German often uses:

• dative for location: wo? = where?
• accusative for direction/movement: wohin? = to where?

So:

• Die Jalousie ist im Büro. = The blind is in the office.
  → location, so dative

But:

• Ich gehe ins Büro. = I’m going into the office.
  → movement/direction, so accusative

Klemmt comes from the verb klemmen.

Here it means something like:

• is stuck
• is jammed
• doesn’t move properly

So Die Jalousie klemmt means the blind is not working smoothly; it is catching or jamming.

Other examples:

• Die Tür klemmt. = The door is sticking / jammed.
• Die Schublade klemmt. = The drawer is stuck.

Because German main clauses normally follow the verb-second rule (V2).

In this sentence:

• Die Jalousie = first element
• klemmt = second element
• heute wieder = the rest

So the structure is:

• Die Jalousie | klemmt | heute wieder.

This is one of the most important patterns in German statements.

You could also move another element to the front, but the verb would still stay second:

• Heute klemmt die Jalousie wieder.
• Im Büro klemmt die Jalousie heute wieder.

These are adverbs giving extra information:

• heute = today
• wieder = again

Together, the sentence means that this problem has happened before and is happening again today.

German often puts time expressions like heute in the middle or toward the end of the sentence, though word order can vary.

Compare:

• Die Jalousie klemmt heute wieder.
• Heute klemmt die Jalousie wieder.

Both are correct, but the emphasis changes slightly.

Here, wieder means again.

So the sense is:

• the blind has been sticking before
• and now it is happening another time

Examples:

• Er ist wieder da. = He is back again.
• Das funktioniert wieder. = That works again.
• Der Computer spinnt wieder. = The computer is acting up again.

Do not confuse wieder with wider:

• wieder = again
• wider = against (much less common in everyday German)

Because in German, klemmen itself already expresses the idea of being stuck/jammed.

So:

• Die Jalousie klemmt. does not mean the blind sticks in the usual English sense.
  It means the blind is stuck / jammed.

German often uses a single verb where English uses be + adjective/past participle.

For example:

• Die Tür klemmt. = The door is stuck.
• Der Reißverschluss klemmt. = The zipper is stuck.

Yes, klemmt is present tense.

• infinitive: klemmen
• die Jalousie klemmt = the blind is stuck / jams

German present tense often covers what English expresses with either:

• simple present
• present progressive
• sometimes even a current state

So Die Jalousie klemmt heute wieder naturally means:

• The blind is stuck again today or
• The blind is jamming again today

Klemmen is a regular verb.

Present tense:

• ich klemme
• du klemmst
• er/sie/es klemmt
• wir klemmen
• ihr klemmt
• sie/Sie klemmen

Since die Jalousie is singular and feminine, it takes the same verb form as sie meaning she/it:

• die Jalousie klemmt

Yes, absolutely. That is a natural German sentence too.

German word order is flexible as long as the verb stays in second position in a main clause.

For example:

• Die Jalousie im Büro klemmt heute wieder.
• Heute klemmt die Jalousie im Büro wieder.
• Im Büro klemmt die Jalousie heute wieder.

These all mean basically the same thing, but the first element gets more emphasis:

• Heute ... emphasizes today
• Im Büro ... emphasizes in the office
• Die Jalousie im Büro ... emphasizes the blind in the office

Yes. Im Büro is attached to die Jalousie here and tells you which blind we mean: the one in the office.

So:

• Die Jalousie im Büro = the blind in the office

This is similar to English noun phrases like:

• the chair by the window
• the book on the table

The full subject is:

• Die Jalousie im Büro

Then the predicate is:

• klemmt heute wieder

The written sentence is already perfectly natural. In speech, people might also say:

• Die Jalousie im Büro klemmt schon wieder.
• Im Büro klemmt die Jalousie wieder.
• Die Jalousie im Büro ist wieder mal verklemmt.

A very common conversational variation is schon wieder, which means again already / yet again and often adds a slight tone of annoyance:

• Die Jalousie im Büro klemmt schon wieder. = The blind in the office is stuck again, as usual / yet again.