To further illuminate the subject--
I'd forgotten about "douse the light." I've certainly heard that one used. Is it well-known?
It appears to have come from nautical slang "douse the glim." I'd run into that phrase before, but just now looked up the origin. "Douse" was sailor slang "To strike or lower in haste; to slacken suddenly; as, douse the topsail." By extension it meant to extinguish. "Glim" was a lantern or candle.
I like this from an 1828 schoolbook.
> On emerging from the bush every man was ordered to douse his glim on pain of being run through, Here the phrase "douse his glim" implies extinguish his torch, a figure familiar to sailors, but obscure to the generality of readers
"Douse his glim" could also mean give him a black eye or even [ut his eye out.

