to treat what is precious as cheap: to squander it, or to be counted worthless
The heart of this word is not overeating but contempt for value: it names someone who takes what is precious and holds it lightly, wasting it. From that one idea the word branches two ways. Applied to a person's whole way of living, it paints the wastrel who pours out money, food, wine, and family standing on his own appetites. Applied to worth itself, it means being counted cheap, the flat opposite of being precious or honored.
Most English Bibles translate it "glutton," but that is a guess drawn from the company it keeps, not the word's core. It sits beside the drunkard in the charge against the rebellious son (Deuteronomy 21:20) and beside heavy meat-eaters in Proverbs, so translators reach for "glutton." Yet in Proverbs 28:7 no food is anywhere in view, and the word still describes the same reckless character. The better sense throughout is the wastrel who makes light of everything valuable.
The same word carries a second, colder use: to be worthless, held in contempt. Jeremiah is told to separate "the precious from the worthless" in his own speech (Jeremiah 15:19), and in Lamentations the ruined city of Zion confesses that she has "become worthless" (Lamentations 1:11). Here the word is the shadow-side of honor. A near-relative in Hebrew, קָלַל, works the same field of being "light" and so treated as trifling, though it is a separate word.