Colloquial British English slang for losing one's sanity.
"She's sending me round the bend!" or "Why'd you throw out a perfectly good steak? Have you gone round the bend?!"
by Gangis May 22, 2008
UK. One who is mentally imbalanced, eccentric, crazy, etc. Sometimes expressed as "right 'round the bend." An eighties tune, during the second "British Invasion" of music in the U.S., had the lyric, "You send me right 'round, baby, 'right round, like a record baby."
Did you see him talking to that tree? 'Round the bend, he is.
by Rod Brock July 24, 2006