a. 1. Rising to the knees; knee-high; as, water or snow knee-deep. [ 1913 Webster ]
Grass knee-deep within a month. Milton. [ 1913 Webster ]
2. Sunk to the knees; as, men knee-deep in water. [ 1913 Webster ]
Where knee-deep the trees were standing. Longfellow. [ 1913 Webster ]