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出ないと

if [someone] doesn’t leave, if [someone] doesn't leave

→ 出る
phrase Common #7,652
if [someone] doesn’t leave The negative form of 出る (to leave, go out) followed by と, expressing a condition. Depending on context, it can also mean “if [someone] doesn’t attend” or “if [someone] doesn’t appear.”
JA: もう出ないと、電車に間に合わないよ。
EN: If we don’t leave now, we’ll miss the train.

車から出ないと

I have to get out of the car.

— 預言者 (2009)

彼は、念のため、暗くなったら外には出ないと娘に約束させた。

Just to be safe, he made his daughter promise not to go outside after dark.

そろそろ出ないと遅れるよ。

We need to leave soon, or we'll be late.

すぐに出ないとダメ？

Do I have to leave right away?

ここから出ないと行くんです

If I don’t leave here, I’ll go.

— ロード・オブ・ザ・リング／二つの塔 (2002)

いいから早く出ないとチェコフ、一体なんだと言うんだ？

Never mind that—hurry up and get out of here, Chekov. What the hell are you talking about?

— スター・トレックII カーンの逆襲 (1982)

phrase Uncommon #14,126
if [someone] doesn't leave A conditional phrase formed from the negative form 出ない (not leave/go out) and と (if/when). It often implies that something bad will happen unless the person leaves, and can also be used to urge someone to leave, as in “we need to leave.”
JA: もう出ないと、電車に間に合わないよ。
EN: If we don't leave now, we'll miss the train.

今すぐ出ないと電車に遅れるぞ。

If you don't leave right now, you'll miss the train.

早く佛山を出ないとチンチュンが手配してる行き先は？

If we don’t leave Foshan soon, where is Chin Chun arranging for us to go?

— イップ・マン 序章 (2008)

俺が先に出ないと妻は出られなかった

My wife couldn't leave unless I left first.

— 雪山の絆 (2023)

ここを出ないとかえって危険よ

It’s actually more dangerous if we don’t leave this place.

— REC / レック (2007)

ここから出ないと男が兄弟を失ったんだぞ

If we don’t get out of here, that man has lost his brother!

— 罪人たち (2025)