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(just) to be on the safe side

Definition

being especially careful in order to avoid something unpleasant: I'm sure it won't rain, but I'll take an umbrella (just) to be on the safe side (= to be ready if it does rain).Cautious and vigilantPaying attention and being careful
(Definition of (just) to be on the safe side from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)