'Flank' in the Bible

But they will swoop downon the Philistine flank to the west.Together they will plunder the people of the east.They will extend their power over Edom and Moab,and the Ammonites will be their subjects.

therefore I am about to expose Moab’s flank beginning with its frontier cities, the pride of the land: Beth-jeshimoth, Baal-meon, and Kiriathaim.

Since you have pushed with flank and shoulder and butted all the weak ones with your horns until you scattered them all over,