From Longman Dictionary of Contemporary Englishbe rushed/run off your feetbe rushed/run off your feetBUSY/HAVE A LOT TO DOto be very busy Before Christmas, most salespeople are rushed off their feet. → foot
Examples from the Corpusbe rushed/run off your feet• He was in livery, and told me he was rushed off his feet.• All the sales assistants are run off their feet. The shop ought to take on more staff.• Obviously, the emergency services are run off their feet.• There had been lots of problems, and they were rushed off their feet.• Bus managers were expecting to be rushed off their feet.• It's my son's birthday party tomorrow. I've been absolutely rushed off my feet getting ready for it.• We were rushed off our feet yesterday.