phrasal in a standing position, in an established position or state, in a recovered condition (as from illness) , in an extemporaneous manner ; while in action
ON ONE'S FEET
Meaning of ON ONE'S FEET in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012