to feel an emotion that is so strong it is impossible to control.
He was beside himself when she didn't come home last night.We were beside ourselves with excitement as we watched the race.
(often + with)
(redirected from be beside yourself)
be beside (oneself)
To be very emotional, especially shocked or distraught. I was beside myself when I found out I'd been rejected from my first-choice school.Honestly, we've all been beside ourselves since the funeral.