One who cuts throats; a murderer; an assassin.
- A murderer, especially one who cuts throats.
- An unprincipled, ruthless person.
- A cutthroat trout.
- Cruel; murderous.
- Relentless or merciless in competition: a cutthroat business.
- Sports & Games Being a form of a game in which each of three or more players acts and scores individually: cutthroat handball; cutthroat bridge.