to get out of (the) bed (on) the wrong side
[get] out of the wrong side of (the|) bedto get out of (the) bed (on) the wrong side
01
to start one's day off badly, without any particular reason
Dialect
British
British
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例
Did you get out of the wrong side of bed this morning? You are a real grouch.
I'm sorry I snapped at you earlier, I think I just got out of bed on the wrong side today.
