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Phrase(s): Put your trust in God, and keep your powder dry. [and] Keep your powder dry.
Prov. Have faith that God will make sure that you win a conflict, but be prepared to fight well and vigorously. (Supposed to have been said by Oliver Cromwell; powder means gunpowder.) • Bill: Am I going to win my lawsuit? Alan: All you can do is put your trust in God, and keep your powder dry.
McGrawhill's American Idioms And Phrasal Verbs