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English definition of “err on the side of caution”

err on the side of caution

to be especially careful rather than taking a risk or making a mistake: 25 people have replied to the invitation, but I've erred on the side of caution and put out 30 chairs.Paying attention and being carefulCautious and vigilant
(Definition of err on the side of caution from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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