A Choke

1. A control on a carburetor to adjust the air/fuel mixture when the engine is cold.
2. (sports) In wrestling, karate (etc.), a type of hold that can result in strangulation.
3. A constriction at the muzzle end of a shotgun barrel which affects the spread of the shot.
4. A partial or complete blockage (of boulders, mud, etc.) in a cave passage.
5. The mass of immature florets in the centre of the bud of an artichoke.
6. (electronics) choking coil
7. A major mistake at a crucial stage of a competition because one is nervous, especially when one is winning.