know which end is up

英語（米国） (en-US) 英語（イギリス） (en-GB)

動詞

慣用表現

(idiomatic) To possess sound judgment or common sense; to have a clear understanding of a situation.

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When hiring new managers, we make sure they know which end is up before giving them full responsibility.

詳細

意味（1）

(idiomatic) To possess sound judgment or common sense; to have a clear understanding of a situation.

He was too stoned to know which end was up.

詳細

knows which end is up （ present singular third-person ）

knowing which end is up （ participle present ）

knew which end is up （ past ）

known which end is up （ participle past ）