something clamped tightly onto another thing: most often a bracelet closed around the arm, once a cover bound down over a jar.
The word does not describe a shape, it describes a grip. It is built from a root about binding two things together so they hold, the same root that gives Hebrew its word for a pair of oxen yoked side by side. Whatever this word names, it names because it is fastened on and stays on.
Six of its seven appearances are jewelry, and always the same piece: a band of gold closed around a woman's wrist or forearm. This is not costume jewelry. Abraham's servant hands Rebekah a pair weighing ten shekels of gold, and Ezekiel twice uses the picture of someone slipping these onto a woman's arms as shorthand for lavish, almost overwhelming, generosity. In Numbers 31:50 the same bands are counted among captured gold and handed over as an offering.
The seventh appearance sits in a completely different world. Numbers 19:15 rules that an open jar with nothing bound over its mouth is unclean, and the word for what should have been bound there is this one. English has to switch words, so the connection is invisible in translation, but the Hebrew is doing the same thing both times: naming what is clamped shut around something.
That is why the two uses can sit under one word. A bracelet is a band closed around an arm. A cover of this kind is a band closed around a jar's mouth. In both, what matters is that it is bound on, not that it decorates or that it hides.