The Collaborative International Dictionary
Flankered
Flanker \Flank"er\, v. t. [imp. & p. p. Flankered; p. pr. & vb. n. Flankering.] [See Flank, v. t.]
To defend by lateral fortifications. [Obs.]
--Sir T. Herbert.To attack sideways. [Obs.]
--Evelyn.
Wiktionary
flankered
vb. (en-past of: flanker)