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shiv (n.)

"a razor," by 1915, possibly 1890s or earlier in underworld slang, a variant (based on pronunciation) of chive, thieves' cant word for "knife" (1670s), of unknown origin. Often said to be a Romany (Gypsy) word, from chivomengro "knife." 

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Definitions of shiv from WordNet

shiv (n.)
a knife used as a weapon;
From wordnet.princeton.edu