(1):

(n.) A discharge of a fetid or ichorous matter from the frog of a horse's foot; - also caled thrush.

(2):

(n.) The frog of a horse's foot.

(3):

(n.) Noise; clatter; crash.

(4):

(a.) Easily broken; brittle; crisp.

(5):

(v. t.) To batter; to break in pieces.