you can't sit in two chairs at the same time

you can't sit in two chairs at the same time

You cannot do or accomplish multiple things simultaneously, so you must choose what is most important to you to pursue. Possibly from Yiddish. The Prime Minister will have to make a decision on how to deal with this soon. You can't sit in two chairs at the same time. Look, either be with me here, or go take the job in London. It's your choice, but you can't sit in two chairs at the same time.
See also: chair, same, sit, time, two
Idioms browser ?
Full browser ?