verb

(of a person or animal) have severe difficulty in breathing because of a constricted or obstructed throat or a lack of air.

Willie choked on a mouthful of tea

gag,retch,cough,struggle for air,fight for breath,gasp

noun

a valve in the carburettor of a petrol engine that is used to reduce the amount of air in the fuel mixture when the engine is started.

an automatic choke