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To move or happen at a slower pace than someone or something else. Why are you guys lagging behind? Pick up the pace! We had thought the turnout for these events would pick up, but it's really lagged behind our estimates.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lag behind (someone or something)
to linger behind someone or something; to fall behind someone or something. Come on up here. Don't lag behind us or you'll get lost. Please don't lag behind the donkeys. Come up here with the rest of the hikers.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. To fail to maintain the pace or progress of someone or something; straggle: I lagged behind the rest of the hikers and got lost. Don't forget to do your readings for class, or you'll lag behind.
2. To proceed or develop with comparative slowness: Sales are lagging behind this year compared to last year.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.