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over the edge

Insane, as in I think he's gone over the edge. This expression alludes to the edge of sanity. [1920s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for over the edge

insane, unhinged, mental, demented, mad, schizophrenic, crazy, lunatic, nuts, sick, psycho, manic-depressive, distracted, psychopathic, unbalanced, certifiable