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Phrase(s): grow apart (from someone or something)
1. Lit. [for things] to separate as they grow. • These trees tend to grow apart from each other as they get bigger. • They need to grow apart so they won’t be too crowded. 2. Fig. [for people] to separate from one another gradually. • Over the years, they grew apart from each other. • Ted and Sharon grew apart and saw less and less of each other.
McGrawhill's American Idioms And Phrasal Verbs