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to fall behind
01
to fail to keep up in work, studies, or performance
Intransitive
Transitive: to fall behind a competitor
Grammatical Information
Composition
phrasal
Action verb
Regular
Inseparable
Particle
behind
Base verb
fall
Present tense
fall behind
3rd person singular
falls behind
Present participle
falling behind
Past simple
fell behind
Past participle
fallen behind
Examples
The company fell behind its competitors in AI research
02
to owe money due to not paying when required
Intransitive
Examples
They 've fallen behind on their mortgage.
