حزام الأمان سليم.

• حزام = belt
• الأمان = safety / security
• سليم = sound, intact, undamaged, okay

So حزام الأمان is literally the belt of safety, which is the normal Arabic way to say seat belt.

In Arabic, the present tense of to be is usually not stated.

So instead of saying The seat belt is intact, Arabic simply says:

حزام الأمان سليم

This is a very common Arabic pattern called a nominal sentence:

• حزام الأمان = the subject
• سليم = the predicate / description

If you wanted a past or future meaning, Arabic would normally use a verb:

• كان حزام الأمان سليمًا = The seat belt was intact.
• سيكون حزام الأمان سليمًا = The seat belt will be intact.

Yes. حزام الأمان is a noun phrase meaning seat belt.

It is built as an iḍāfa (an annexation or construct phrase), which often works like X of Y in English.

So:

• حزام الأمان = belt of safety

Arabic often uses this structure where English uses a compound noun:

• باب البيت = the door of the house = the house door
• مفتاح السيارة = the key of the car = the car key
• حزام الأمان = the belt of safety = the seat belt

Because in an iḍāfa phrase, the first noun normally does not take الـ.

So Arabic says:

• حزام الأمان

not:

• الحزام الأمان

In an iḍāfa, definiteness is usually controlled by the second noun. Since الأمان is definite, the whole phrase حزام الأمان is definite.

That is why حزام الأمان can mean the seat belt even though حزام itself has no الـ.

In this phrase, الأمان is the second part of the iḍāfa, and it is definite. That makes the whole phrase definite.

Compare:

• حزام أمان = a safety belt / a seat belt
• حزام الأمان = the safety belt / the seat belt

So الـ on الأمان helps make the whole noun phrase definite.

Here, سليم is not just an adjective modifying الأمان or حزام inside the noun phrase. It is the predicate of the whole sentence.

Structure:

• حزام الأمان = subject
• سليم = predicate

So the sentence means:

• The seat belt is intact / sound / okay.

If سليم were directly describing حزام inside one noun phrase, the structure would be different.

Because it agrees with حزام, which is a masculine singular noun.

So:

• حزام الأمان سليم = The seat belt is intact.

If the subject were feminine, the predicate would usually be feminine too:

• السيارة سليمة = The car is intact / in good condition.

In this kind of nominal sentence, the predicate is often indefinite.

So Arabic normally says:

• حزام الأمان سليم

not usually:

• حزام الأمان السليم

The form السليم would more naturally sound like the intact one or would need a different context.

As a basic rule:

• subject: often definite
• predicate: often indefinite

This is very common in Arabic:

• الجو جميل = The weather is nice.
• الكتاب مفيد = The book is useful.
• حزام الأمان سليم = The seat belt is intact.

In full formal Arabic with case endings, it would be:

حِزامُ الأمانِ سليمٌ

Breakdown:

• حِزامُ = nominative, because it is the subject of the nominal sentence
• الأمانِ = genitive, because it is the second noun in an iḍāfa
• سليمٌ = nominative, because it is the predicate

In normal spoken reading or pause form, these endings are often not pronounced, so learners commonly hear: حزام الأمان سليم

A careful pronunciation is:

ḥizāmu l-amāni salīmun
or in pause: ḥizām al-amān salīm

A simpler learner-friendly version is:

hi-ZAAM al-a-MAAN sa-LEEM

Notes:

• ح is a stronger, breathy h sound, not the ordinary English h
• ز sounds like z
• سليم has a long ee sound

Not exactly. سليم has a range of meanings depending on context, such as:

• sound
• intact
• undamaged
• unharmed
• in good condition

So in this sentence, سليم suggests that the seat belt is in proper working condition.

Depending on context, English might translate it as:

• The seat belt is intact.
• The seat belt is fine.
• The seat belt is in good condition.

Yes, but it means something slightly different.

• الحزام سليم = The belt is intact
• حزام الأمان سليم = The seat belt is intact

So if the context already makes it clear that you are talking about a seat belt, الحزام سليم may work. But حزام الأمان is more specific.

Yes. It is a complete and natural Arabic sentence.

It is a nominal sentence made of:

• مبتدأ (subject): حزام الأمان
• خبر (predicate): سليم

Arabic does not need an expressed present-tense is, so this is fully complete as it stands.