Extinguish (a fire or light):he sent her and Peter back to dout the fire...
Well they douted the light and they said goodnight to the landlord then they made their way home.
noun
A cigarette end:he inserts the dout off-centre between his lips...
He shuffled his way around the streets dragging his right leg behind him, a bit like "the mummy" in the old movies, puffing away at a dowt he had picked up in the gutter and wearing a cloth cap and raggy clothes.
Origin
Early 16th century (as a verb): contraction of do out. The noun dates from the 1940s.