cut·throat / ˈkətˌ[unvoicedth]rōt/ • n. 1. a murderer or other violent criminal.2. (also cutthroat trout) a trout (Salmo clarki) of western North America, with red or orange markings under the jaw.• adj. (of a competitive situation) fierce and intense; involving the use of ruthless measures. ∎ (of a person) using ruthless methods in a competitive situation. ∎ relating to a game or contest in which individuals score against the other players. ∎ denoting a form of whist (or other card game normally for four) played by three players.