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1. Make untidy or dirty
you've messed up my beautiful carpet
2. (of a domestic animal) Defecate
they had some problems with dogs messing in the store
3. Make dirty by defecating
he feared he would mess the bed
4. Take one's meals in a particular place or with a particular person, esp. in an armed forces' mess
I messed at first with Harry, who was to become a lifelong friend
they messed together