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切らなきゃ

must cut, have to cut, must turn off, have to switch off

→ 切らす
切ら cut; operate on + なきゃ conditional (if ...)
verb · informal Rare #38,138
must cut, have to cut Colloquial shortening of 切らなければ (いけない／ならない), expressing necessity.
JA: 髪を切らなきゃいけない。
EN: I have to get my hair cut.
must turn off, have to switch off Colloquial shortening of 切らなければ (いけない／ならない), expressing necessity.
JA: 出かける前に電源を切らなきゃ。
EN: I have to turn off the power before I leave.

髪を切らなきゃ。

I need to get a haircut.

トムは髪を切らなきゃいけない。

Tom needs to get a haircut.

友人が来たんで切らなきゃならん

A friend came over, so I have to hang up.

— レザボア・ドッグス (1992)

そんな風に言っていただけるなんて当然切らなきゃね

I can’t believe you’d say something like that. Of course I have to cut it, right?

— 紅夢 (1991)