The Collaborative International Dictionary
Flankering
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
flankering
vb. (present participle of flanker English)