false alarm

直訳広義慣用表現古語

(literally) A warning signal (such as the call of sentry, the ringing of a bell, or the shriek of a siren) which turns out to have been given erroneously.

日本語の意味

誤警報：実際には何の危険もないにもかかわらず、誤って警告が発せられること。 / 虚報：警告や警報が本来あるべき根拠なく、誤って伝えられた情報を指す場合に使われる用語。

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The sentry's shout turned out to be a false alarm, waking the entire garrison.

Google翻訳 / DeepL翻訳

見張りの叫びは誤警報で、駐屯地全体を目覚めさせてしまいました。

詳細

意味（1）

(literally) A warning signal (such as the call of sentry, the ringing of a bell, or the shriek of a siren) which turns out to have been given erroneously.

Then, if they rise, shout the alarm at the top of your voice … but be careful not to rouse the camp by a false alarm, for if you do, instead of gaining credit we shall become the jest of the whole force.

Google翻訳 / DeepL翻訳