bottom edge

Short definition from Wiktionary

Noun

1. 1
   Used other than figuratively or idiomatically: see bottom, edge.
2. 2
   The edge of a bat closest to the ground.
3. 3
   A deflection of a ball off of the bottom edge of a bat, onto the ground and potentially into the wicket.

Verb

1. 1
   To hit the ball with the bottom edge of the bat.