adv. phr. 1. Standing or walking; not sitting or lying down; up. Before the teacher finished asking the question, George was on his feet ready to answer it. In a busy gasoline station, the attendant is on his feet all day.
Compare: TO ONE'S FEET.
Antonym: OFF ONE'S FEET. 2. Recovering; getting better from sickness or trouble. Jack is back on his feet after a long illness. Susan was on her feet soon after the operation. The bank loaned the store money to get it back on its feet after the fire. 3. See: LAND ON ONE'S FEET, STAND ON ONE'S OWN FEET, THINK ON ONE'S FEET.