- 1the side of something such as a building or mountain The sun lit up the western flank of the hill.
- 2the left or right side of an army during a battle, or a sports team during a game Our orders were to attack their left flank. Their center made a dash down the right flank.
- 3the side of an animal between the rib and the hip She patted the horse's flank.
Check pronunciation: flank