What is "to pick a crow"

Crow \Crow\, n. [AS. cr[=a]we a crow (in sense 1); akin to D. kraai, G. kr[aum]he; cf. Icel. kr[=a]ka crow. So named from its cry, from AS. cr[=a]wan to crow. See Crow, v. i. ]

1. (Zo["o]l.) A bird, usually black, of the genus Corvus, having a strong conical beak, with projecting bristles. It has a harsh, croaking note. See Caw.

   Note: The common crow of Europe, or carrion crow, is Corvus corone. The common American crow is Corvus Americanus. See Carrion crow, and Illustr., under Carrion.

2. A bar of iron with a beak, crook, or claw; a bar of iron used as a lever; a crowbar.

   Get me an iron crow, and bring it straight Unto my cell.
   --Shak.

3. The cry of the cock. See Crow, v. i., 1.

4. The mesentery of a beast; -- so called by butchers.

   Carrion crow. See under Carrion.

   Crow blackbird (Zo["o]l.), an American bird ( Quiscalus quiscula); -- called also purple grackle.

   Crow pheasant (Zo["o]l.), an Indian cuckoo; the common coucal. It is believed by the natives to give omens. See Coucal.

   Crow shrike (Zo["o]l.), any bird of the genera Gymnorhina, Craticus, or Strepera, mostly from Australia.

   Red-legged crow. See Crough.

   As the crow flies, in a direct line.

   To pick a crow, To pluck a crow, to state and adjust a difference or grievance (with any one).