الترزي بيضيق الكم.

A natural Egyptian pronunciation is roughly:

et-terzi beyḍayyeʔ el-komm

A simple breakdown:

• الترزي → et-terzi
• بيضيق → beyḍayyeʔ
• الكم → el-komm

You may hear small vowel differences from speaker to speaker, such as bi- instead of be-.

Because ت is a sun letter.

In Arabic, when الـ comes before a sun letter, the l sound of the article assimilates to the next consonant. So:

• الترزي is pronounced et-terzi, not el-terzi

By contrast, ك in الكم is a moon letter, so the l sound stays:

• الكم → el-komm

الترزي means the tailor.

The basic noun is ترزي = tailor.
The الـ makes it definite, so الترزي = the tailor.

بيضيق comes from the verb ضيّق, which means to make something narrow or to tighten it.

So in this sentence, بيضيق means:

• narrows
• tightens
• or, depending on context, is narrowing

Its basic past form is ضيّق = he narrowed / he tightened.

In Egyptian Arabic, بـ is the usual marker for the present tense in everyday speech.

So:

• ضيّق = he narrowed / tightened
• بيضيق = he narrows / tightens / is narrowing

This verb is also third-person masculine singular, because the subject الترزي is singular and masculine.

Because normal Arabic writing usually leaves out most short-vowel marks and often leaves out shadda too.

So you may see:

• بيضيق

But a more fully marked version would be:

• بيضيّق

Likewise, الكم may be written without showing the doubled m, even though it is pronounced el-komm.

Because Arabic does not need a separate present-tense is before a verb.

English says:

• The tailor is narrowing the sleeve

Egyptian Arabic can simply say:

• الترزي بيضيق الكم

So the sentence can mean either:

• The tailor narrows the sleeve
• The tailor is narrowing the sleeve

The exact meaning depends on context.

Here, الكم means the sleeve.

It is not the same word as كم؟ meaning how many / how much.

That is a very common learner confusion because they are written similarly without full vowel marks. In this sentence, the clothing context makes it clear that الكم means the sleeve.

Because subject + verb + object is very common and natural in Egyptian Arabic.

So:

• الترزي = subject
• بيضيق = verb
• الكم = object

A verb-first structure exists in Arabic more generally, but this SVO order is extremely normal in everyday Egyptian speech.

Because both nouns are definite:

• الترزي = the tailor
• الكم = the sleeve

This suggests a specific tailor and a specific sleeve, not just any tailor or any sleeve. In real-life context, it often means a known tailor is altering a known garment.