What does the word flank mean?

Usage examples for flank

  1. He had counted most on aid from Cunningham and Mahommed Gunga, but that source seemed to have failed him; and he gave up hope of their arrival when a body of several thousand rebels took up position on his flank and cut off approach from the direction whence Cunningham should come. – Rung Ho! by Talbot Mundy
  2. Is there anything like a flank movement in boarding, Captain Breaker? – A Victorious Union SERIES: The Blue and the Gray--Afloat by Oliver Optic
  3. There he will call upon his friends and attack us in the flank. – Poet Lore, Volume XXIV, Number IV, 1912 by Various