that cock won't fight

that cock won't fight

old-fashioned "Cock" in this usage refers to a rooster.
1. That claim, argument, or explanation is inaccurate or unfounded. A: "Our company could have really been successful if you hadn't held us back like that!" B: "Come off it, Jack, that cock won't fight. I've done all I could to make this company a success, and you know it."
2. That idea or proposal is not viable or has no chance of succeeding; that won't work. Tom wants to sue them, but that cock won't fight if you ask me. They've got enough money to hire the best legal team in the country.
See also: cock, fight, that
Farlex Dictionary of Idioms.
See also:
  • fashion
  • cock socket
  • cocksocket
  • I'll be bound
  • a rogues' gallery
  • blowed
  • (Well,) I'll be blowed!
  • I'll be blowed
  • (Well,) I'll be darned!