Definition of hit-off:
(v) :
(heading, physical) To strike.
(v) :
(transitive) To administer a blow to, directly or with a weapon or missile.
(v) :
(transitive) To come into contact with forcefully and suddenly.
(v) :
(intransitive) To strike against something.
(v) :
(transitive) To activate a button or key by pressing and releasing it.
(v) :
(transitive, slang) To kill a person, usually on the instructions of a third party.