[ I or T ] If you choke, or if something chokes you, you stop breathing because something is blocking your throat:

[ T ] to make someone stop breathing by pressing their throat with the hands

[ T usually passive ] also choke up to fill something such as a road or pipe, so that nothing can pass through:

[ I ] also choke it informal (usually in sports) to fail to do something at a time when it is urgent, usually because you suddenly lose confidence:

a device in a motor vehicle that changes the amount of air going into the engine, allowing more fuel compared to air to go in and therefore making the engine easier to start