from
The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]
Stately colonnades are flanked with trees. --Pitt.
[1913 Webster]
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.
[1913 Webster]