The stream of water issuing through a flood-gate; or the gate itself. If the word had its origin in shutting; it denoted the frame of boards or planks which closes the opening of a mill dam; but I believe it is applied to the stream, the gate and channel. It is a common saying, that a rapid stream runs like a sluse.

An opening; a source of supply; that through which any thing flows. Each sluice of affluent fortune open’d soon.

To emit by flood-gates.

a more correct orthography of sluice.