言わなきゃ

have to say, must say

→ 言う
言わ say, tell + なきゃ Necessitative (must)
verb · necessitative Rare #25,633
have to say, must say Informal contraction of 言わなければならない or 言わなくてはいけない.
JA: 本当のことを言わなきゃ。
EN: I have to tell the truth.
Conjugation of 言う

死ぬのやめるって言わなきゃこれ燃やすわよ

If you don't say you'll stop trying to die, I'll burn this.

— 映画 聲の形 (2016)

言わなきゃいいのに

You really should’ve kept that to yourself.

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)

あんなこと言わなきゃよかった

I wish I hadn’t said that.

言わなきゃ

I have to tell them.

— 自転車泥棒 (1948)

うん言わなきゃ

I have to say yes.

— 生きる (1952)

今日のお酒お礼を言わなきゃ

I need to thank them for the drinks today.

— Article 15 (2019)

言わなきゃ死ぬぞ

Tell me, or you'll die!

— ミスティック・リバー (2003)