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Phrase(s): drift apart (from each other)
1. Lit. [for floating things] to separate as they drift. • The boats drifted apart from one another. • The boats drifted apart in the waves. 2. Fig. [for people] to lead their lives without contact with each other having been together or friendly. • He drifted apart from his friends. • As the years went by, they drifted apart.
McGrawhill's American Idioms And Phrasal Verbs