to pour out a liquid, above all as a drink offering poured out to a god; and, by the same picture, to pour molten metal into a mold to cast an image.
At its core this word is about pouring, and its most common use is a specific act of worship: tipping out wine or another liquid before a god as a gift. Israel did this for the LORD at the altar, but the prophets use the same word again and again for the drink offerings people poured out to other gods, which is why it so often carries the smell of disloyalty.
The same physical picture, liquid running out of a vessel, stretches in two further directions. Metalworkers poured molten metal into a mold, so the word also means to cast or found an image, the shining idol a craftsman makes. And once, in a striking image, God is said to pour out over people a spirit of deep sleep, as if drowsiness were a liquid poured over them.
Because English has no single word that covers pouring a libation, casting a statue, and pouring out a spirit, translators reach for whatever fits the scene: pour out, offer, cast. The one steady thread is the act of pouring itself.