Spotkajmy się na trzecim peronie.

Spotkajmy się means let’s meet.

It comes from the verb spotkać się, which means to meet up / to meet each other.
The form spotkajmy is the 1st person plural imperative, so it is used when the speaker includes themselves: let’s ...

So:

• spotkać się = to meet
• spotkajmy się = let’s meet

This is different from simply saying meet!, which would be directed at someone else.

Się is part of the verb spotkać się.

Many Polish verbs are used with się, and in this case it helps express the idea of meeting each other / meeting up rather than meeting someone as a direct object.

Compare:

• spotkać kogoś = to meet someone
• spotkać się = to meet up / to meet one another

In this sentence, się is necessary. You would not normally say Spotkajmy na trzecim peronie.

Because Spotkajmy się is the natural and direct way to say Let’s meet.

It is a standard Polish imperative form used for suggestions involving we:

• chodźmy = let’s go
• zróbmy = let’s do
• spotkajmy się = let’s meet

English uses let’s + verb, while Polish often uses this special imperative ending -my.

Because after na meaning on / at for a location, Polish uses the locative case.

Here the sentence answers Where shall we meet?
So it is about location, not movement.

• na trzecim peronie = on platform three / at the third platform

If you were talking about movement toward the platform, you would often use the accusative:

• Idę na trzeci peron. = I’m going to platform three.

So:

• na + locative = location
• na + accusative = movement toward

Because the adjective must agree with the noun in case, gender, and number.

The basic form is:

• trzeci = third

But in na trzecim peronie, the noun peron is in the locative singular, so the adjective must also be in the locative singular masculine:

• trzeci peron = the third platform
• na trzecim peronie = on the third platform

This kind of adjective agreement is a core feature of Polish grammar.

Because peron is in the locative singular after na when expressing location.

Its forms include:

• peron = platform
• na peronie = on the platform

So in the full phrase:

• na trzecim peronie = on the third platform

This ending -ie is a common locative ending for masculine nouns, though not every noun follows exactly the same pattern.

Yes, in this context peron means platform, especially at a train station.

So:

• peron = platform
• na peronie = on the platform

A learner should note that Polish station language often uses peron very naturally, just as English does.

Usually on platform three is the most natural English translation, especially in British English.

Depending on context, English might also say:

• at platform three
• on the third platform
• at the third platform

But the most idiomatic translation for station announcements or meeting arrangements is often:

• Let’s meet on platform three.

Even though Polish literally says on the third platform, English often prefers platform three.

Yes, but na trzecim peronie is the more normal, neutral order.

Polish word order is flexible, and adjectives can sometimes come after the noun, especially for emphasis, style, or in certain fixed expressions. But for everyday speech:

• na trzecim peronie = standard, natural

A learner should usually stick with adjective + noun here.

A rough pronunciation guide is:

spot-KAI-mih shyeh na TSHE-chim pe-RO-nyeh

A few helpful points:

• się sounds roughly like shyeh
• trz in trzecim is difficult for English speakers; it sounds something like tsh or chsh, depending on the speaker
• rz often sounds like zh or merges with ż
• peronie has three clear syllables: pe-ro-nie

If you want to sound natural, try saying it smoothly:

Spotkajmy się na trzecim peronie.

Yes, but it means something slightly different.

• Spotkajmy się na trzecim peronie. = Let’s meet on platform three.
  This is a suggestion or proposal.

• Spotkamy się na trzecim peronie. = We will meet on platform three.
  This sounds more like a statement of plan or future fact.

So both are correct, but Spotkajmy się is the better match for Let’s meet.