fall behind
phrasal verb with fall verb uk/fɔːl/ usfell | fallen
[ I ] FINANCE
to not make a regular payment at the time you should:
fall behind with sth We started to fall behind with our mortgage payments when my husband lost his job.
[ I or T ]
to not finish work at the time you planned or promised to finish it:
fall behind by three weeks/six months/10 days, etc. Severe weather conditions caused the construction project to fall behind by over three months.
If we fall behind schedule we may lose the contract.
[ I or T ]
to not make as much progress as someone else:
Companies that failed to modernize fell behind quite dramatically.