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気をつけなければいけない

must be careful

→ 気
phrase Rare #37,122
must be careful A polite expression of obligation meaning that someone needs to be careful or watch out. Often used with に to indicate what to be careful about.
JA: 階段では足元に気をつけなければいけない。
EN: You must be careful on the stairs.

トムは食物アレルギーがあるので、食べる物に気をつけなければいけない。

Tom has food allergies, so he has to be careful about what he eats.

健康にはよく気をつけなければいけない。

You have to take good care of your health.

ドライバーは道を横断する子供たちに気をつけなければいけない。

Drivers must watch out for children crossing the road.