Meaning of “get up on the wrong side of the bed” in the English Dictionary

american-english dictionary

"get up on the wrong side of the bed" in American English

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get up on the wrong side of the bed

to wake up in a bad mood:

Dad got up on the wrong side of bed, and he’s been grumpy all day.

(Definition of “get up on the wrong side of the bed” from the Cambridge Academic Content Dictionary © Cambridge University Press)