الصوف بيكش في الميه السخنة.

A natural pronunciation would be something like:

iṣ-ṣūf biyikish fil-mayya is-sakhna

A few notes:

• الصوف → iṣ-ṣūf
  The ل of ال is absorbed because ص is a “sun letter,” so you hear ṣṣ.
• بيكش → biyikish
• في الميه often gets pronounced together as fil-mayya
• السخنة → is-sakhna

Exact pronunciation can vary a bit by speaker and region.

Yes, literally الصوف is the wool, but in Arabic, definite nouns are often used to talk about things in general.

So الصوف بيكش... means something like:

• Wool shrinks...
• literally: The wool shrinks...

This is very normal in Arabic when stating general facts.

بيكش is the Egyptian present-tense form of the verb meaning to shrink.

The بيـ prefix is very common in Egyptian Arabic and usually marks the habitual/present tense. In a sentence like this, it gives the sense of a general truth:

• بيكش = it shrinks / does shrink

So the sentence is not about one single moment only; it sounds like a general fact.

Because it agrees with الصوف, which is treated as a singular noun.

In Arabic, non-human nouns are often grammatically singular, and the verb matches that. Here:

• الصوف = wool
• بيكش = it shrinks

The verb is in the 3rd person singular masculine form, which is the normal default for a noun like this.

في means in.

So:

• في الميه = in the water

In this sentence, it shows the condition or environment in which the shrinking happens:

• بيكش في الميه السخنة = shrinks in hot water

الميه is the normal Egyptian Arabic word for water.

• الميه / الميّة = Egyptian Arabic
• الماء = Modern Standard Arabic / formal Arabic

So if you're learning Egyptian, الميه is exactly what you would expect in everyday speech.

In Arabic, adjectives normally come after the noun they describe.

So:

• الميه = the water
• السخنة = the hot

Together:

• الميه السخنة = the hot water

This is the normal Arabic word order for noun + adjective.

Because الميه is grammatically feminine, and the adjective has to agree with it.

So:

• الميه = feminine noun
• السخنة = feminine adjective

This agreement is required in Arabic. If the noun is feminine, the adjective must also be feminine.

Because in Arabic, if the noun is definite, the adjective must also be definite.

Here:

• الميه = the water
• السخنة = the hot

So Arabic says literally:

• the water the hot

But in good English, that becomes:

• the hot water

This matching of definiteness is a basic rule in Arabic adjectives.

Yes. In Egyptian Arabic, hot is often said as:

• سخن = hot (masculine)
• سخنة = hot (feminine)

In more formal Arabic, you would often see:

• ساخن
• ساخنة

So السخنة is a very normal Egyptian colloquial form.

Yes. That is exactly how it sounds.

Because of the بيـ in بيكش, the sentence naturally reads as a general statement:

• Wool shrinks in hot water
• Wool does shrink in hot water

It does not sound like a one-time dramatic event unless context makes it specific.

Yes. In more formal Arabic, you would use different words and forms, for example something like:

• الصوف ينكمش في الماء الساخن

That is much more formal / MSA-like.

The original sentence:

• الصوف بيكش في الميه السخنة

sounds Egyptian and conversational, which is what you want for everyday spoken Egyptian Arabic.

Yes, several things:

• الميه instead of الماء
• the present marker بيـ in بيكش
• السخنة as a colloquial Egyptian form

So the sentence is clearly in Egyptian Arabic, not Modern Standard Arabic.