Put out the light; also knock out a man's eye. To douse is to lower in haste, as “Douse the top-sail” Glim, gleam, glimmer, are variants of the same word.
`And so you would turn honest, Captain Goffe, agrazing, would ye,' said an old weather-beaten pirate who had but one eye; `what though he ... made my eye dowse the glim ... he is an honest man' ...
—The Pirate, chap. xxxiii.