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Phrase(s): God willing.
If God wants it to happen. (An expression indicating that there is a high certainty that something will happen, so high that only God could prevent it.) • John: Please try to be on time. Alice: I’ll be there on time, God willing. • Bob: Will I see you after your vacation? Mary: Of course, God willing.
McGrawhill's American Idioms And Phrasal Verbs