The Collaborative International Dictionary of English v.0.48:
Undershoot \Un`der*shoot"\, v. t. To shoot short of (a mark). [1913 Webster]WordNet (r) 3.0 (2006):
undershoot v 1: fall short of (the runway) in a landing; "The plane undershot the runway" 2: shoot short of or below (a target) [ant: overshoot]