razor-siping Share definition Flag Manufactured lateral slices in the sole of a shoe which flex open when walking. Usually extant to provide wet-surface traction. Keen footwear, New Balance footwear, and Vibram FiveFingers all have razor-siping on their soles. razor-siping by Evan Sharp May 16, 2008 0 0 Get merch Get the razor-siping mug. Buy Now — $32.95 See more merch