gate

(noun): A doorlike structure outside a house.
(noun): Doorway, opening, or passage in a fence or wall.
(noun): Movable barrier.
(noun): A logical pathway made up of switches which turn on or off. Examples are and, or, nand, etc.
(noun): The gap between a batsman's bat and pad.
(noun): The amount of money made by selling tickets to a concert or a sports event.
(noun): (flow cytometry) A line that separates particle type-clusters on two-dimensional dot plots.
(noun): Passageway (as in an air terminal) where passengers can embark or disembark.
(noun): The controlling terminal of a field effect transistor (FET).
(noun): In a lock tumbler, the opening for the stump of the bolt to pass through or into.
(noun): The channel or opening through which metal is poured into the mould; the ingate.
(noun): The waste piece of metal cast in the opening; a sprue or sullage piece. Also written geat and git.
(noun): A mechanism, in a film camera and projector, that holds each frame momentarily stationary behind the aperture.
(noun): A tally mark consisting of four vertical bars crossed by a diagonal, representing a count of five.
(verb): To keep something inside by means of a closed gate.
(verb): To punish, especially a child or teenager, by not allowing them to go out.
(verb): To open a closed ion channel.
(verb): To furnish with a gate.
(verb): To turn (an image intensifier) on and off selectively as needed, or to avoid damage. See autogating.

The gate in front of the railroad crossing went up after the train had passed.
Singh was bowled through the gate, a very disappointing way for a world-class batsman to get out.