blackjacked
black-jacked
verb
Struck someone, often from behind, with a heavy object to incapacitate them.
"The guard was blackjacked and tied up."
Thesaurus
Synonyms: twenty-one, blackjack, vingt-et-un, sap, cosh, pressure, blackmail, jack oak, blackjack oak, Quercus marilandica, Jolly Roger, black flag