be on your feet
to be standing, especially for a long time

[TahlilGaran] Dictionary of Contemporary English ▲

stand to be on your feet in an upright position:
There were no seats, so we had to stand.
When we entered, Stephen was standing by his desk.
be on your feet to be standing, especially for a long time:
If you have young kids, you’re on your feet all day.
I’d been on my feet since 7 o'clock and I needed to sit down.
The crowd were all on their feet clapping and calling for more.
get up to stand after you have been sitting or lying down:
He got up and turned off the TV.
Mum fell in her flat and was unable to get up.
stand up to stand after you have been sitting, or to be in a standing position:
I stood up when she came in and shook her hand.
It’s generally better to do this exercise standing up.
get to your feet written to stand up, especially slowly or when it is difficult for you:
My attorney got slowly to his feet, breathing heavily.
rise formal to stand after you have been sitting, especially at a formal event:
As the bride entered the cathedral, the congregation rose.
Audience members rose to their feet, cheering and clapping.

[TahlilGaran] English Thesaurus ▲

on your feet
on (your/its) feet
feeling better or being in better condition.
He's the one who put the company on its feet again.

Usage notes: often used in the form back on your feet:
After his mother died, it took him a few months to get back on his feet.

[TahlilGaran] English Idioms Dictionary ▲