Flank \Flank\ (fl[a^][ng]k), v. t. [imp. & p. p. {Flanked} (fl[a^][ng]kt); p. pr. & vb. n. {Flanking}.] [Cf. F. flanquer. See {Flank}, n., and cf. {Flanker}, v. t.] 1. To stand at the flank or side of; to border upon. Stately colonnades are flanked with trees. --Pitt. 2. To overlook or command the flank of; to secure or guard the flank of; to pass around or turn the flank of; to attack, or threaten to attack; the flank of.