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をお忘れなく

don't forget

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phrase Rare #32,609
don't forget A polite, often formal reminder meaning “don't forget [something].” It follows the thing to be remembered, such as 傘をお忘れなく (don't forget your umbrella).
JA: 出発前にパスポートをお忘れなく。
EN: Don't forget your passport before you leave.

お帰りの際は傘をお忘れなく。

Don't forget your umbrella when you leave.

ベルトをお忘れなく

Don't forget your belt.

— es［エス］ (2001)

あなたにはいつも私がついている事をお忘れなく。

Never forget that I’m always by your side.

契約書へのサインをお忘れなく。

Don't forget to sign the contract.