underlap

Short definition from Wiktionary

Verb

1. 1
   To be overlapped by; to protrude underneath.
2. 2
   to move in an underlap

Noun

1. 1
   A portion of material that is overlapped by another.
2. 2
   A player's position or movement inside and forward of an attacking team-mate (contrasted with an overlap, which is outside and forward)