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English definition of “be good, and if you can't be good, be careful”

be good, and if you can't be good, be careful

humorous saying
used to tell someone to enjoy themselves at an event or during an activity, but not to take risksPaying attention and being carefulCautious and vigilant
(Definition of be good, and if you can't be good, be careful from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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