(1):

(n.) Any species or rail of the genera Crex and Porzana; - so called from its singular cry. See Corncrake.

(2):

(n.) A boast. See Crack, n.

(3):

(v. t. & i.) To boast; to speak loudly and boastfully.

(4):

(v. t. & i.) To cry out harshly and loudly, like the bird called crake.