The Collaborative International Dictionary of English v.0.48:
Knee-high \Knee"-high`\, a. Rising or reaching upward to the knees; as, the water is knee-high. [1913 Webster]WordNet (r) 3.0 (2006):
knee-high adv 1: up to the knees; "we were standing knee-deep in the water" [syn: knee-deep, knee-high] n 1: a sock or stocking that reaches up to just below the knees [syn: knee-high, knee-hi]