الهدوم دي غالية.

A natural word-by-word breakdown is:

• الهدوم = the clothes / clothes
• دي = this / these
• غالية = expensive / dear

So the sentence is literally something like the clothes these expensive, which in natural English is These clothes are expensive.

Because in Egyptian Arabic, demonstratives like ده / دي / دول usually come after the noun.

For example:

• الكتاب ده = this book
• البنت دي = this girl
• الهدوم دي = these clothes

So English says these clothes, but Egyptian Arabic says something more like the clothes these.

That is just how Egyptian Arabic normally forms noun phrases with demonstratives. The noun is usually definite, so it takes الـ.

So:

• الهدوم دي = these clothes

Even though it looks literally like the clothes these, it is the normal way to say these clothes in Egyptian Arabic.

This is a very common Arabic pattern: non-human plurals are often treated grammatically like feminine singular.

Since الهدوم means clothes, and clothes are non-human, the adjective appears in the feminine singular form:

• غالية = expensive, feminine singular

So even though the meaning is plural in English, the grammar in Arabic often behaves as if it were feminine singular.

It is not said. In Arabic, the present-tense verb to be is usually omitted.

So:

• الهدوم دي غالية = These clothes are expensive

There is no separate word for are here. Arabic simply puts the subject first and the description after it.

Because the sentence structure is:

• الهدوم دي = the subject, these clothes
• غالية = the predicate, expensive

So the sentence is built as:

• these clothes + expensive

Also, in Arabic, adjectives normally follow the noun. Compare:

• الهدوم الغالية = the expensive clothes
• الهدوم دي غالية = these clothes are expensive

In the second sentence, غالية is not just modifying the noun inside the phrase; it is telling you something about the whole subject.

A rough pronunciation is:

el-hodoom di ghaalya

A few notes:

• الهدوم sounds like el-hodoom
• دي sounds like dee
• غ in غالية is a throaty sound, often compared to the French r
• غالية sounds roughly like ghaalya

So altogether:

el-hodoom dee ghaalya

هدوم is a very common Egyptian colloquial word for clothes.

In Modern Standard Arabic, you are more likely to see words like:

• ملابس
• ثياب

A more Standard Arabic version would commonly be:

• هذه الملابس غالية

So the sentence you were given is specifically everyday Egyptian Arabic.

Yes.

• الهدوم غالية = the clothes are expensive / clothes are expensive
• الهدوم دي غالية = these clothes are expensive

Adding دي makes it more specific and points to a particular set of clothes.

Yes. In Egyptian Arabic, دي is basically the feminine singular demonstrative, but it is also commonly used with non-human plurals, because those often behave grammatically like feminine singular nouns.

So with الهدوم, دي is naturally understood as these.

Compare:

• البنت دي = this girl
• الهدوم دي = these clothes

So the same form دي can correspond to different English translations depending on the noun.

For non-human plurals like الهدوم, دي is the most natural and common choice in Egyptian Arabic.

You will often see:

• الهدوم دي
• العربيات دي
• الكتب دي

For human plurals, دول is very common:

• الولاد دول = these boys
• البنات دول = these girls

So for learners, الهدوم دي is the safest and most natural form to use.

Not always. The adjective غالي / غالية can also mean dear, valuable, or precious, depending on context.

For example:

• الهدوم دي غالية = these clothes are expensive
• شخص غالي عليّا = someone dear to me

So the core idea is something like high in value, but the exact English translation depends on the situation.