Még ha hosszú is a sor, bemegyünk a próbafülkébe.

It means even if.

So:

• Még ha hosszú is a sor = Even if the line/queue is long
• bemegyünk a próbafülkébe = we’ll go into the fitting room

This structure expresses concession: something is true, but it does not change the result.

By itself, még often does mean still or yet.

But in the fixed expression még ha, it helps create the meaning even if. So here you should understand még ha as a unit, not translate még word by word.

For example:

• Még ha fáradt is vagyok... = Even if I’m tired...
• Még ha drága is... = Even if it’s expensive...

Not really. In this sentence, is is part of the concessive pattern még ha ... is.

So hosszú is a sor does not mean the line is also long here. Instead, the is helps build the sense of even if.

This is a very common Hungarian pattern:

• Még ha nehéz is = Even if it’s difficult
• Még ha késő is van = Even if it’s late

Both word orders are possible in Hungarian, but they do not feel exactly the same.

• a sor hosszú = a more neutral statement: the line is long
• hosszú is a sor = puts more emphasis on hosszú within this még ha ... is pattern

So in this sentence, Hungarian foregrounds the idea long:

• Még ha hosszú is a sor... = Even if the line is long...

You may also see:

• Még ha a sor hosszú is...

That is also possible, but the given sentence highlights hosszú more directly.

Here sor means line or queue.

Hungarian sor can have several meanings depending on context, such as:

• a line/queue of people
• a row
• a series

In this sentence, because of the fitting room context, it clearly means the line / the queue.

Bemegyünk breaks down like this:

• be- = in, into
• megy = go
• -ünk = we

So bemegyünk literally means we go in / we go into.

Hungarian usually does not need a separate subject pronoun like we, because the verb ending already shows the subject.

That is why mi (we) is not necessary here.

Hungarian often uses the present tense for future meaning when the context makes it clear.

So bemegyünk can mean:

• we go in
• we’re going in
• we’ll go in

Here the whole sentence naturally has a future sense in English, even though Hungarian uses present tense.

This is very normal in Hungarian.

The ending -ba/-be means into. It shows movement toward the inside of something.

So:

• próbafülkébe = into the fitting room / changing booth

Compare:

• a próbafülkében = in the fitting room (location, no movement)
• a próbafülkébe = into the fitting room (movement)

The form is -be here because of vowel harmony.

a means the, while egy means a/an.

In Hungarian, the definite article is often used when the situation makes the thing identifiable from context. In a shop, there is a known fitting-room area, so a próbafülkébe sounds natural.

• a próbafülkébe = into the fitting room
• egy próbafülkébe = into a fitting room / into one fitting room

Using egy would put more emphasis on one / some fitting room, while a sounds more like the normal, expected place.

It is a compound noun:

• próba = trying, especially trying on clothes
• fülke = booth, cubicle

So próbafülke literally means something like trying-on booth, and in natural English that is fitting room, changing booth, or changing cubicle, depending on context.

Yes. Hungarian verbal prefixes often separate from the verb in certain situations.

In a neutral statement, the prefix stays attached:

• bemegyünk = we go in

But with negation, focus, or some question patterns, it can separate:

• Nem megyünk be. = We are not going in.
• Mikor megyünk be? = When are we going in?

So in your sentence, bemegyünk is attached because the clause is a neutral affirmative statement.