1) Feline activity 2) Scratching 3) Seizing in a certain way 
• (p. pr. & vb. n.) of Claw
The downward curving of the butt portion of the shingle. This creates a hump along the leading edge and a widening of the cutout. The bulge thus created is susceptible to substantial damages by wind action, hail, and ice. Clawing is part of the normal aging process of shingles, and is a sign of long service...