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ならなきゃ

have to become, must become

→ 成る
verb · informal Rare #40,233
have to become, must become Colloquial contraction of ならなければ (ならない).
JA: もっと強くならなきゃ。
EN: I have to get stronger.
Conjugation of 成る
Necessitative
ならんならぬなるべきはならないならなきゃ

濃くならなきゃ変ですよ

It'd be strange if it didn't get darker.

— Perfect Days (2023)

自分の子供の良き手本とならなきゃ駄目なんだよ。

You have to set a good example for your children.

子供のために強くならなきゃ

I have to be strong for my child.

— ROMA/ローマ (2018)

会社をクビにならなきゃいいけどね。

I just hope I don't get fired.