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fall behind

phrasal verb with fall
 
/fɔːl/
 
US  /fɑːl/ verb (fell, fallen)

Definition

to fail to do something fast enough or on time: He was ill for six weeks and fell behind with his schoolwork. I've fallen behind with the mortgage payments.Failing and doing badly
(Definition of fall behind from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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