المطعم بيبقى زحمة يوم الجمعة بالليل.

In Egyptian Arabic, بيبقى often means is, ends up being, or tends to be, depending on context.

Here it gives a habitual/usual meaning, so the sentence is describing what normally happens on Friday nights.
So بيبقى زحمة is something like:

• is crowded
• gets crowded
• tends to be crowded

A useful breakdown is:

• يبقى = be / become / remain
• بـ at the beginning often marks the habitual/present in Egyptian Arabic

So بيبقى suggests it usually is / it tends to become.

In Arabic, the simple present often has no verb “to be” in sentences like The restaurant crowded = The restaurant is crowded.

But بيبقى is added when the speaker wants to show something like:

• a repeated situation
• a general pattern
• something that becomes true at certain times

So:

• المطعم زحمة = The restaurant is crowded / The restaurant is crowded right now
• المطعم بيبقى زحمة يوم الجمعة بالليل = The restaurant is usually crowded on Friday night

Using بيبقى makes the sentence feel less like a statement about right now and more like a statement about what normally happens.

زحمة is a very common Egyptian word. It can mean:

• crowded
• packed
• busy
• congested

You will hear it in lots of situations:

• الشارع زحمة = The street is crowded / traffic is bad
• المكان زحمة = The place is crowded
• الدنيا زحمة = Everything is crowded / chaotic

In this sentence, زحمة describes the restaurant, so it means crowded or busy.

It behaves a bit flexibly in Egyptian Arabic.

Historically and literally, زحمة is a noun related to crowding/congestion, but in everyday Egyptian it is very often used like an adjective meaning crowded.

So in a learner-friendly way, you can think of المطعم زحمة as:

• literally: The restaurant is crowding/congestion
• naturally: The restaurant is crowded

This kind of usage is very normal in spoken Arabic.

Both can be possible depending on style and context, but يوم الجمعة is very common and clear.

• يوم = day
• الجمعة = Friday

So يوم الجمعة literally means the day of Friday, or simply on Friday.

In Egyptian Arabic, adding يوم often makes time expressions sound natural and explicit.

Compare:

• الجمعة = Friday
• يوم الجمعة = on Friday / Friday

In this sentence, يوم الجمعة بالليل means on Friday at night or Friday night.

Days of the week in Arabic are normally definite, so Friday is الجمعة, not just جمعة in this meaning.

So:

• السبت = Saturday
• الأحد = Sunday
• الاثنين = Monday
• الجمعة = Friday

That is just the standard way these day names are usually said.

بالليل means at night or in the evening/at night, depending on context.

It is made of:

• بـ = a preposition often meaning in / at
• الليل = the night

So literally it is something like in the night.

In Egyptian Arabic, بالليل is a very common time expression:

• بروحله بالليل = I go to him at night
• الجو بيبرد بالليل = It gets cold at night

In your sentence, يوم الجمعة بالليل means on Friday night.

The order is:

• المطعم = the restaurant
• بيبقى زحمة = is/gets crowded
• يوم الجمعة بالليل = on Friday night

This is a very normal Arabic structure:

subject + predicate + time expression

So Arabic often gives the main statement first, then adds the time:

• المطعم بيبقى زحمة = The restaurant gets crowded
• يوم الجمعة بالليل = on Friday night

English can do the same thing:

• The restaurant gets crowded on Friday night

In Egyptian Arabic, ق is usually pronounced as a glottal stop in everyday speech.

So بيبقى is commonly pronounced roughly like:

biyib’a or bib’a

The middle vowel can vary a little depending on speaker and speed, but the important thing is that ق here is not usually a strong q sound in everyday Egyptian pronunciation.

So a rough full pronunciation of the sentence is:

el-matʕam biyib’a zaḥma yōm el-gomʕa bil-lēl

That is only an approximation, but it is close enough to help a learner.

Yes. In natural English, busy can be a very good translation here.

Because زحمة does not always point only to physical crowd density. It can also suggest that the place is:

• full of people
• lively
• hard to move around in
• very active

So depending on context, these can all work:

• The restaurant is crowded on Friday night.
• The restaurant gets crowded on Friday night.
• The restaurant is busy on Friday night.
• The restaurant gets busy on Friday night.

You may hear في with time expressions sometimes, but in this sentence it is not necessary.
يوم الجمعة بالليل already works naturally as a time phrase.

In Egyptian Arabic, many time expressions appear without a separate word for on:

• النهارده = today
• بكرة = tomorrow
• يوم الجمعة = on Friday
• بالليل = at night

So the sentence sounds natural as it is. Adding في is usually unnecessary here.

Usually المطعم means the restaurant, so it often refers to a specific restaurant known from context.

But in real conversation, Arabic sometimes uses the definite form in a slightly broader way than English. Depending on context, it could mean:

• the restaurant we are talking about
• this restaurant
• sometimes even a restaurant understood from the situation

So the exact force of المطعم depends on context, but the basic form is definitely the restaurant.

A natural Egyptian way would be:

المطعم زحمة دلوقتي

That means The restaurant is crowded now.

Notice that you usually would not need بيبقى if you are talking about the current moment.
That is because بيبقى often suggests a repeated or typical situation.

So compare:

• المطعم زحمة دلوقتي = The restaurant is crowded now
• المطعم بيبقى زحمة يوم الجمعة بالليل = The restaurant gets/is usually crowded on Friday night