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売らなきゃ

have to sell, must sell

→ 売る
売ら sell + なきゃ Necessitative (must)
verb · necessitative Rare #39,071
have to sell, must sell Informal contraction of 売らなければ, meaning “if [I/you/etc.] don’t sell” and commonly used to express obligation.
JA: 今日中にこの商品を売らなきゃ。
EN: I have to sell this product by the end of today.
Conjugation of 売る
Necessitative
売らなきゃ

売らなきゃ―金はできない

If I don’t sell it, I’ll never make any money.

— イップ・マン 序章 (2008)

家を売らなきゃいけないんだ。

I have to sell my house.

昔は、飛行機を持ってたけど、売らなきゃいけなかったんだ。

I used to own a plane, but I had to sell it.

今売らなきゃ全てを失うんだぞ

If you don't sell now, you'll lose everything.

— フィールド・オブ・ドリームス (1989)