(transitive) To eat (parts of) another of one's own species.The female black widow spider is known to cannibalise the male.
(transitive) To remove parts of (a machine, etc) for use in other similar machines.
1991, Anthony Kemp, The SAS at War 1941–1945 (John Murray (Publishers) Ltd):When the attack ceased they managed to cannibalize parts to get one truck going and set off for the rendezvous with Fraser, only to find nobody there.
(transitive, business) To reduce sales or market share (for one of your own products) by introducing another.
2012, electronista, October 17, 2012:iPad mini to cannibalize 1M full-size iPad sales.