From Longman Dictionary of Contemporary Englishbe rushed/run off your feetbe rushed/run off your feetBUSY/HAVE A LOT TO DOto be very busyBefore Christmas, most salespeople are rushed off their feet. →foot
Examples from the Corpus
be rushed/run off your feet• He was in livery, and told me he was rushed off his feet.• All the salesassistantsare 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.• Busmanagers 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 feetyesterday.