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off the deep end

see go off the deep end.

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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

foolhardyill-consideredthoughtlessirresponsiblecarelessunwiseill-advisedfoolishrecklesstrickyuncertainunhealthyunsoundtreacheroushazardousunsafeprecariousperiloussensitivedelicate