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Phrase(s): drop away
1. Lit. to fall off; to fall away. • The leaves were still dropping away from the trees in November. • The dead branches dropped away from the tree. 2. Fig. [for a group of people] to decline in number over time through disinterest or attrition. • His friends gradually dropped away as the years passed. • As the other contenders dropped away, Mary’s chances for election improved.
McGrawhill's American Idioms And Phrasal Verbs