(just) to be on the safe side being especially careful in order to avoid something unpleasant 谨慎起见;以防万一 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). 我知道不会下雨，但是为了以防万一，我还是要带把伞。 Will you undertake a review of his work? Just to be on the safe side. 你愿意检查他的医病记录么?就是为慎重起见。