'round the bend
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."
'round the bend by Rod Brock July 24, 2006
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