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なきゃ

if not, unless; have to, must, if there isn't; unless there is

→ だ
auxiliary · informal Rare #23,251
if not, unless; have to, must Colloquial contraction of なければ. Often used with ダメ or いけない to mean “have to” or “must.”
JA: 早く帰らなきゃ。
EN: I have to go home soon.
Conjugation of だ
Necessitative
なきゃならん

もっと静かにしてなきゃだめよ

You need to be quieter.

— ジョジョ・ラビット (2019)

おれがあの時間に戻ってなきゃ大変なことになってた

If I hadn't gone back at that time, things would've turned out badly.

— シカゴ (2002)

寝てなきゃダメだよ

You need to be asleep.

— ８ 1／2 (1963)

今でなきゃダメ？

Does it have to be now?

— ロード・オブ・ザ・リング／二つの塔 (2002)

呼ぶのに暫くかかったぞ客に注意してなきゃすみません注文は？

It took you a while to call me. You need to pay attention to the customers. Sorry. What would you like to order?

— 人生スイッチ (2014)

それでなきゃ権藤さんにすまん

Otherwise, I'd be letting Gondo down.

— High and Low (1963)

おとなしくしてなきゃダメでしょ。

You have to behave yourself, okay?

— となりのトトロ (1988)

厳しくなきゃいけないからね

Because you have to be strict, you know.

— ライフ・イズ・ビューティフル (1997)

adjective Rare #40,403
if there isn't; unless there is A casual contraction of なければ. In phrases like なきゃだめ, it can express that something is necessary: “must” or “have to.”
JA: 予約がなきゃ入れません。
EN: You can't get in unless you have a reservation.
Forms of 無い
ないなかったなく無いねえなさそうなければなくてねぇなき無かった無くなくてもなきゃなけりゃ

質問がなきゃ

If there are no questions.

— シカゴ (2002)

だが何か利益がなきゃだめだぞ

But there has to be something in it for you.

— 帰ってきたヒトラー (2015)

チビでなきゃね

You have to be short, right?

— 最強のふたり (2011)

遺体がなきゃ何もできません

Without the body, we can't do anything.

— エリート・スクワッド ブラジル特殊部隊BOPE (2010)