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Idioms and Phrases with over the edge

over the edge

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

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