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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Question 1 of 7
What does “Promethean” mean?
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.