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1. To fall off of something. If this many needles are dropping away from the Christmas tree, it's definitely time to get rid of it.
2. To become sequentially absent one at a time, or gradually decline in number or quantity. Attendance usually spikes after the New Year and then drops away. During the playoffs, teams drop away until only two are left to play each other in the championship game.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.