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do in is a verb meaning "get rid of (someone who may be a threat) by killing". It carries one recorded sense.
get rid of (someone who may be a threat) by killing
“The mafia liquidated the informer”
“the double agent was neutralized”
Definitions, synonyms and semantic relations for do in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.