Etymology
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overkill (n.)

"capacity to kill in excess of what is required or wanted," 1958, from over- + kill (v.). Originally in reference to nuclear arsenals; the general sense is from 1965. The verb is attested from 1946.

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Definitions of overkill

overkill (n.)
the capability to obliterate a target with more weapons (especially nuclear weapons) than are required;
overkill (n.)
any effort that seems to go farther than would be necessary to achieve its goal;
From wordnet.princeton.edu