Definition of flanker:
(n) :
(rugby) A player who plays in the back row of the scrum.
(n) :
(American football) A wide receiver who lines up behind the line of scrimmage.
(n) :
(business, marketing) A usually lower-end brand or product introduced in order to target competitors and protect a company's main market share.
(n) :
(military) A fortification or soldier projecting so as to defend another work or to command the flank of an assailing body.
(n) :
(archaeology) One of a pair of large upright monoliths erected on either end of the recumbent, in recumbent stone circles of Aberdeenshire, Scotland, and the counties of Cork and Kerry in south-west of Ireland.
(v) :
(obsolete) To defend by lateral fortifications.