n. too much. : That is enough. Any more is just overkill.
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
overkill (n.)
1958, from over + kill (v.). Originally in reference to nuclear arsenals; the general sense is from 1965. The verb is attested from 1946.