verb
to fall behind or fail to keep up with others
preposition
to be in a position further back than others
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The company's outdated technology caused them to lag behind their competitors in the market.
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If you don't keep up with the latest trends, you'll start to lag behind everyone else.
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Dude, if you don't pick up the pace, you're gonna be lagging behind the rest of the group.
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His lack of motivation caused him to lag behind in life, while others moved ahead.