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Phrase(s): Better (be) safe than sorry.
Prov. Cliché You should be cautious—if you are not, you may regret it. • It may be time-consuming to check the oil in your car every time you buy gasoline, but better safe than sorry. • Bob: I don’t need a tetanus shot just because I stepped on a nail. Mary: I still think you should get one. Better be safe than sorry.
McGrawhill's American Idioms And Phrasal Verbs