'bump off' definitions:

Definition of 'bump off'

(from WordNet)
verb
Kill intentionally and with premeditation; "The mafia boss ordered his enemies murdered" [syn: murder, slay, hit, dispatch, bump off, off, polish off, remove]

Definition of 'bump off'

From: GCIDE
  • bump off \bump` off"\, v. t. To kill (a person); to murder; -- used commonly of planned assassination by criminals; as, the mob bumped off all the witnesses. [Colloq.] [PJC]

Synonyms of 'bump off'

From: Moby Thesaurus