Prije nego što uđeš, odveži vezice i otkopčaj mokri kaput da se brže osuši.

It means before.

More literally, prije nego što is a set phrase meaning before + clause, as in:

• Prije nego što uđeš = Before you go in / before you enter

Croatian often uses this full expression before a verb. You may also hear shorter variants like prije nego in speech, but prije nego što is very standard and clear.

Because Croatian is using the perfective verb ući here, not the imperfective ulaziti.

• ući = to enter, to go in once, successfully
• ulaziti = to be entering, to go in habitually/repeatedly

In prije nego što uđeš, the idea is before you complete the action of entering. That is why uđeš is natural.

This is very common in Croatian: after time expressions like before, a perfective present can refer to a future completed action.

So:

• prije nego što uđeš = before you enter
• not really before you are entering

Because Croatian usually drops subject pronouns when the verb ending already shows who the subject is.

Here the endings tell us everything:

• uđeš = you enter
• odveži = untie! to you
• otkopčaj = unbutton/unfasten! to you

So adding ti is unnecessary unless you want emphasis or contrast.

They are 2nd person singular imperatives: commands addressed to one person.

• odveži = untie
• otkopčaj = unbutton / unfasten

They come from the verbs:

• odvezati = to untie
• otkopčati = to unbutton, unfasten

These are both perfective verbs, which fits well because the speaker wants each action to be done as a completed step.

If you were speaking to more than one person, or using formal you, you would say:

• odvežite
• otkopčajte

Vezice is the direct object, so it is in the accusative plural.

The base noun is:

• vezica = lace, shoelace, string

Plural:

• vezice = laces / shoelaces

In this sentence:

• odveži vezice = untie the laces

For this noun, the accusative plural looks the same as the nominative plural, so you see vezice in both roles.

Most likely, yes.

By itself, vezice can mean laces, ties, or similar strings, depending on context. But with odveži and the everyday situation in the sentence, a learner should understand it as shoelaces.

So:

• odveži vezice = untie your shoelaces / untie the laces

Croatian often leaves out words that English might spell out more explicitly.

This is about the adjective form.

The noun is:

• kaput = coat

The adjective is:

• mokar = wet

In masculine singular, Croatian has a short form and a long form for some adjectives:

• mokar
• mokri

In modern usage, mokri kaput is very natural, especially when referring to a specific coat already known in the situation: the wet coat / your wet coat.

Also, because kaput is masculine singular inanimate, its accusative looks like the nominative, so the form stays:

• otkopčaj mokri kaput

A learner should mainly remember that mokri kaput is perfectly normal here. You may also encounter mokar kaput, but the nuance can be slightly different.

Literally, it means:

• so that it dries faster

Breakdown:

• da = so that
• se = marks the verb as reflexive/intransitive here
• brže = faster, more quickly
• osuši = dries / becomes dry

So the whole idea is:

• otkopčaj mokri kaput da se brže osuši
• unbutton the wet coat so that it dries faster

Because osušiti and osušiti se do not mean exactly the same thing.

• osušiti nešto = to dry something
• osušiti se = to dry, to become dry

Examples:

• Osušio sam kaput. = I dried the coat.
• Kaput se osušio. = The coat dried / became dry.

So in your sentence, the coat is the thing that becomes dry by itself, which is why Croatian uses se:

• da se brže osuši = so that it dries faster

Because brže is the comparative adverb: faster / more quickly.

• brzo = quickly
• brže = faster

So:

• da se brzo osuši = so that it dries quickly
• da se brže osuši = so that it dries faster

The sentence is comparing the result of unbuttoning the coat with not unbuttoning it: it will dry faster that way.

The subject is kaput.

So the meaning is:

• the coat dries
• not you dry

That is why the verb is 3rd person singular:

• kaput ... osuši se = the coat dries

Even though kaput appears earlier in the sentence, it is still the understood subject of the da-clause.

Because Prije nego što uđeš is an introductory subordinate clause.

Croatian normally separates that kind of opening clause with a comma:

• Prije nego što uđeš, ...

Then the main instruction follows:

• odveži vezice i otkopčaj mokri kaput...

So the comma helps mark the boundary between:

1. the time clause
2. the main clause

Yes, to some extent. Croatian word order is flexible, but the original order is very natural.

Original:

• Prije nego što uđeš, odveži vezice i otkopčaj mokri kaput da se brže osuši.

This puts the time condition first, which sounds very normal in instructions.

You could rearrange parts for emphasis, but not every change sounds equally natural. For example:

• Odveži vezice i otkopčaj mokri kaput prije nego što uđeš.

This is still understandable, but the original sounds more like a smooth instruction: Before you go in, do these things.

So yes, word order can move, but the sentence as given is a very good default pattern to learn.