top edge

Short definition from Wiktionary

Noun

1. 1
   The edge of a bat farthest from the ground.
2. 2
   A deflection of a ball off of the top edge of a bat, into the air and potentially for a catch.
3. 3
   Used other than figuratively or idiomatically: see top, edge.

Verb

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