verb
to fail to keep up with something or someone
adverb
to be in a position that is not as advanced as others in a competition or race
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The company's competitors are advancing quickly, and we cannot afford to fall behind.
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I need to study harder or I'll fall behind in my classes.
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If you don't keep up with the latest trends, you'll totally fall behind.
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She worked hard to stay ahead in the race, never wanting to fall behind.