Definition of “fall behind (something)” - English Dictionary

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“fall behind (something)” in American English

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fall behind (something)

phrasal verb with fall us /fɔl/ verb past tense fell /fel/ , past participle fallen /ˈfɔ·lən/

to fail to do something fast enough or on time:

We fell behind schedule.
He fell behind in his work.

(Definition of “fall behind (something)” from the Cambridge Academic Content Dictionary © Cambridge University Press)