to buy grain or food: to purchase provisions, especially when they are scarce
This is the ordinary word for buying grain or food, and it belongs almost entirely to one setting: a shortage severe enough that people must travel to where the food is. Most of its uses cluster in the story of Joseph, where famine drives a whole region down to Egypt to buy what they can no longer grow. Unlike the general verb for purchasing anything, קָנָה, this word keeps its eye on food and provisions.
The prophet Isaiah later turns the word on its head. Using the everyday language of the marketplace, he calls the thirsty to come and buy food and drink "without money and without price." The commercial verb becomes the very way to describe receiving what money cannot obtain, a free gift dressed in the words of a purchase.