drop behind
American Heritage Dictionary of Idioms:
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drop behind
Fall short of the normal pace or progress. For example, The teacher said Greg was dropping behind the class and needed extra help.
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Copyrights:
American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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