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話さなきゃ

have to talk, must speak

→ 話す
話さ to speak; to talk + なきゃ Necessity (must / have to)
verb · informal Rare #39,797
have to talk, must speak A colloquial contraction expressing obligation, from 話さなければならない.
JA: 彼に話さなきゃ。
EN: I have to talk to him.
Conjugation of 話す
Necessitative
話すべき話さなきゃ

リノと話さなきゃどうすべきか分かるはず

You should know what to do if you don’t talk to Rino.

— アイム・スティル・ヒア (2024)

人の気持ち考えて話さなきゃダメよ。

You need to think about other people's feelings when you talk.

話さなきゃだめじゃない！

You have to say something!

— 箪笥＜たんす＞ (2003)