Definition of backcheck:
(v) :
(transitive, ice hockey) To check (an opposing player) while skating toward or near one's own goal.
(v) :
(intransitive, ice hockey) To engage in checking while skating toward or near one's own goal.
(v) :
(quality control) To check someone else's work after they have completed it, in a backward-looking type of review or audit, especially one that runs on a backchannel workflow in parallel with the main workflow (and thus is not a rate-determining or throughput-bottlenecking step).
(n) :
The act of backchecking.