One cannot be in two places at once

can't be in two places at once

To be unable to exist in two or more places or do two or more things simultaneously. I don't know what more the boss wants me to do—I can't be in two places at once! I told you already, I'll come help you in a minute, sweetie. I'm cooking dinner, I can't be in two places at once.
See also: once, place, two

One cannot be in two places at once.

Prov. You cannot be in more than one place or do more than one thing at the same time. Child: Mom! Mom! Come help me wash my hair! Mother: Just a minute! I'm putting clean sheets on your bed right now, and I can't be in two places at once.
See also: cannot, once, one, place, two