Source : Webster's Revised Unabridged Dictionary (1913)

Knee-deep \Knee"-deep`\, a.
   1. Rising to the knees; knee-high; as, water or snow
      knee-deep.

            Grass knee-deep within a month.       --Milton.

   2. Sunk to the knees; as, men knee-deep in water.

            Where knee-deep the trees were standing.
                                                  --Longfellow.

Source : WordNet®

knee-deep
     adj : coming only to the ankle or knee [syn: {ankle-deep}]
     adv : up to the knees; "we were standing knee-deep in the water"
           [syn: {knee-high}]