Mentang-mentang kita bermain beregu, jangan lupa genggaman itu.

Mentang-mentang is a fixed expression that usually means just because or simply because. It often carries a slightly critical or warning tone.

So in this sentence, it suggests something like:

Just because we are playing doubles, ...

The repetition is not regular plural-style reduplication. Mentang-mentang is simply the normal form of this expression.

It is commonly used when the speaker thinks someone should not make a certain assumption, for example:

• Mentang-mentang dia kaya, jangan sombong.
  Just because he is rich, don’t be arrogant.

So the tone here is not neutral; it sounds like a reminder or mild reproach.

In standard Malay:

• kita = we, including the listener
• kami = we, excluding the listener

So kita bermain beregu means the speaker includes the person being spoken to: we are playing doubles.

If it said kami bermain beregu, it would mean we are playing doubles, but not you. That would not fit as well if the speaker is addressing their teammate or someone involved in the game.

Bermain means to play.
Beregu means in pairs, as a pair, or in sports contexts, doubles.

So bermain beregu means to play doubles or to play as a pair/team of two.

This is especially common in sports such as badminton, tennis, or table tennis.

• main perseorangan = play singles
• main beregu = play doubles

Even though the literal pieces are something like play in-pair formation, the natural English meaning is simply play doubles.

They come from different roots and do different jobs.

• bermain comes from main and means to play
• beregu comes from regu and means to be in a team/pair formation, or more naturally, to play as doubles

So even though both have ber-, they are not redundant in a bad way. Malay often allows this kind of combination.

Here:

• bermain gives the main action
• beregu gives the mode or format of that action

So the phrase means something like to play in doubles format.

Jangan is used to form a negative command: don’t.
Lupa means forget.

So jangan lupa means don’t forget.

This is a very common pattern in Malay:

• Jangan pergi. = Don’t go.
• Jangan takut. = Don’t be afraid.
• Jangan lupa. = Don’t forget.

It is a straightforward imperative. The subject you is usually understood and does not need to be stated.

Both can work, but they are slightly different in feel.

• jangan lupa genggaman itu = don’t forget that grip
• jangan lupakan genggaman itu = don’t forget that grip

The version without -kan is very common and natural in speech. It is a little lighter and more conversational.

The version with -kan makes the object relationship more explicit and can sound a bit more formal or emphatic.

So in this sentence, jangan lupa genggaman itu is perfectly normal.

Genggaman comes from the root genggam, which means to grip, to grasp, or to hold tightly.

Adding -an often creates a noun. So:

• genggam = grip/grasp
• genggaman = a grip, grasp, hold, or something being held

In this sentence, genggaman itu probably means that grip or that hold.

Depending on context, it could refer to:

• the way someone holds a racket
• a physical grip of the hand
• possibly a handclasp or grasp

The exact English choice depends on the situation, but grammatically it is a noun.

In Malay, demonstratives usually come after the noun:

• buku ini = this book
• rumah itu = that house
• genggaman itu = that grip

This is the normal word order in Malay. So if you are thinking in English word order, it may feel reversed, but in Malay it is standard.

Also, itu often implies that the thing is already known, visible, or previously mentioned.

It is usually at least slightly negative, critical, or sarcastic.

It often suggests:

• someone is making an excuse
• someone is acting too confident
• someone is assuming too much

So mentang-mentang kita bermain beregu... sounds like:

• Just because we’re playing doubles...
• Don’t assume that because we’re playing doubles...

It is not usually used for a completely neutral statement.

It is understandable and grammatical, but its tone depends a lot on context.

What stands out most is mentang-mentang, which gives it a slightly dramatic or admonishing tone. It sounds like the speaker is correcting someone’s attitude or reminding them not to overlook something.

Also, genggaman itu is fairly specific. It sounds most natural if both speaker and listener already know which grip is being referred to.

So overall, the sentence sounds natural if:

• the context is already clear
• the speaker is giving a warning or reminder
• the conversation is about doubles play and a specific grip/hold

Without context, it may sound a bit dramatic or poetic, but not wrong.