(1) To batter is to build a rock wall back either at a uniform angle, or to angle it back in steps.
(2) Batter is the angle at which an abutment or rock wall is inclined against the earth it retains.
(1) A little batter is better than a lot so it doesn't fall over and batter you better.
(2) If you batter the wall, you'll make it easier to walk along this stretch of trail. You listening, Ed?