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言わなきゃ

have to say, have to tell

→ 言う
言わ say + なきゃ Must; have to
verb · informal Rare #29,539
have to say, have to tell Colloquial contraction of 言わなければならない or 言わなければいけない.
JA: 今すぐ本人に言わなきゃ。
EN: I have to tell them right away.
Conjugation of 言う
Necessitative
言うべき言わなきゃ言わせない

うんて言わなきゃ

I have to say yes.

— 生きる (1952)

あんなこと言わなきゃよかった。

I wish I hadn’t said that.

今日のお酒のお礼を言わなきゃ

I need to thank them for the drinks today.

— Article 15 (2019)

診てくれてありがとうって言わなきゃ

I have to thank them for seeing me.

— 紅夢 (1991)

言わなきゃ死ぬぞ！

Tell me, or you'll die!

— ミスティック・リバー (2003)

言わなきゃいいのに。

You really should’ve kept that to yourself.