Definitions for do in
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Princeton's WordNet
neutralize, neutralise, liquidate, waste, knock off, do in(verb)
get rid of (someone who may be a threat) by killing
"The mafia liquidated the informer"; "the double agent was neutralized"
Wiktionary
do in(Verb)
To kill or end.
Citation
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"do in." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/do in>.