over the side of a ship or boat, esp. into or in the water: to fall overboard.
—Idiom
2.
go overboard, to go to extremes, esp. in regard to approval or disapproval of a person or thing: I think the critics went overboard in panning that new show.
Origin: bef. 1000; ME over bord, OE ofer bord.See over, board
in. to do far more than is necessary. : Now don't go overboard for us. We're just folks.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
overboard
"over the side of a ship," O.E. ofor bord, from bord "the side of a ship." Fig. sense of "excessively, beyond one's means" (esp. in phrase to go overboard) first attested 1931 in Damon Runyon.
Show excessive enthusiasm, act in an excessive way. For example, It's easy to go overboard with a new stock offering, or She really went overboard, hiring the most expensive caterer. [Mid-1900s]