to go out or be put out: a lamp, fire, or life snuffed into darkness
This is a poetic word for a flame dying. Almost every time it appears, a light or a fire stops burning: a lamp is snuffed out, a fire is quenched, and the darkness closes back in. Outside a handful of poetic books (Job, Proverbs, Psalms, Isaiah) it is not used at all, so it always carries a heightened, image-rich tone rather than plain everyday speech.
Its most fixed use is the picture of "the lamp of the wicked" being put out. In the world of Proverbs and Job, a burning lamp stands for a person's life, prosperity, and continuing family line; when the wicked man's lamp goes dark, it means his success collapses and his line is cut off, suddenly and for good. Six of its nine appearances are exactly this warning.
The same image of a fire dying serves to describe enemies destroyed: an army or a hostile crowd flares up and then is quenched like a dying blaze. A single further use stretches the picture to water rather than fire, where seasonal desert streams shrink and vanish in the heat. The everyday, prose word for putting out a flame is כָּבָה; this rarer word keeps almost entirely to poetry and to the theme of a life or a foe being extinguished.