Я возьму любую рубашку, лишь бы не опоздать на встречу.

Возьму is the 1st person singular future form of взять.

• взять = a perfective verb, meaning to take / grab / pick up
• Because it is perfective, it forms the future with a simple future form: я возьму = I will take / I’ll grab

Here it suggests a single completed action: the speaker will just grab a shirt quickly. It does not emphasize an ongoing process.

Yes. Любой / любая / любое often means any in the sense of it doesn’t matter which one.

So любую рубашку means:

• any shirt
• whatever shirt
• I’m not being picky

It shows that the speaker’s main concern is not the shirt itself, but something else.

A useful comparison:

• любую рубашку = absolutely any shirt will do
• какую-нибудь рубашку = some shirt or other

So любую sounds a bit stronger: the choice truly does not matter.

Because they are in the accusative case, since they are the direct object of возьму.

The basic forms are:

• любая → любую
• рубашка → рубашку

Why accusative? Because the speaker is taking something.

So:

• Я возьму что? → любую рубашку

This is standard Russian object marking.

Лишь бы is a fixed expression meaning:

• as long as
• provided that
• sometimes if only

It introduces the only condition that really matters.

In this sentence, the idea is:

• the speaker does not care which shirt they take,
• as long as they are not late for the meeting.

It often has a slightly emotional or practical feel: everything else is secondary.

Here не опоздать is an infinitive, and that is very natural after лишь бы in this kind of sentence.

It gives a compact meaning like:

• just not to be late
• so long as I’m not late
• as long as I don’t end up being late

Russian often uses the infinitive this way when the idea is general or concise.

A more explicit version is also possible:

• Я возьму любую рубашку, лишь бы я не опоздал на встречу.

That version names the subject again and uses a finite verb. But the original with the infinitive sounds shorter and smoother.

Опоздать means to be late or to arrive late.

It is the normal Russian verb for missing the proper time of an event:

• опоздать на урок = to be late for class
• опоздать на поезд = to miss / be late for the train
• опоздать на встречу = to be late for a meeting

So in this sentence, не опоздать means not to be late.

Because Russian normally says:

• опоздать на что? = to be late for what?

So:

• на встречу = for the meeting / to the meeting

This is a standard pattern with events and scheduled things:

• на урок
• на концерт
• на работу
• на встречу

Compare:

• на встречу = to the meeting / for the meeting
• на встрече = at the meeting
• к встрече = for the meeting, in preparation for it

So only на встречу fits after опоздать here.

Because лишь бы introduces a subordinate clause or clause-like phrase, and Russian normally separates that with a comma.

So the structure is:

• main clause: Я возьму любую рубашку
• subordinate idea: лишь бы не опоздать на встречу

That is why the comma is needed.

Yes. Russian often omits subject pronouns when they are clear from the verb ending.

So this is also natural:

• Возьму любую рубашку, лишь бы не опоздать на встречу.

The ending -у in возьму already shows I.

Including Я can:

• add a bit of emphasis,
• sound slightly more explicit,
• or just reflect the speaker’s style.

Both are possible, but they mean slightly different things.

• возьму любую рубашку = I’ll grab / pick any shirt
• надену любую рубашку = I’ll put on any shirt

The original focuses on the choice or grabbing of a shirt quickly.
If the speaker wanted to emphasize actually wearing it, надену would be more direct.

So the original sounds like: I don’t care which shirt I pick, I just can’t be late.