birl / burl [bɜrl]
birl – v. tr. – 1. N. Amer. cause (a floating log) to rotate by using one’s feet; 2. spin
burl – n. – 1. N. Amer. – a flattened knotty growth of a tree; 2. burl – a swirled pattern in the grain of wood; the rounded knob forming the base of a deer’s horn; 3. a knot or lump in wool or cloth