massekhah

This is the Bible's signature word for a forbidden metal idol, and it is the word behind the golden calf at Mount Sinai. It began as a craftsman's term. The root idea is pouring: molten gold, silver, or bronze poured into a mold, or beaten metal overlaid on a wooden core. From that workshop meaning it hardened into a moral and religious label for exactly the kind of image Israel was commanded never to make.

Because it names how the thing was made rather than what it depicted, the word can cover any poured or plated cult-object, whatever its shape. In practice the objects it names are calves, other national idols, and the plated images the prophets mock. Scripture often pairs it with a companion word for a carved image (פסל), and the two together stand for every kind of man-made god.

Over time the word became a kind of confession. Later writers reached back for it on purpose: to tie the calves that northern kings set up at Bethel and Dan back to the sin at Sinai, and to remind worshipers in psalm and prayer of the wilderness rebellion. The prophets pressed it further still, turning a metalworking term into a charge that a poured lump of silver could never be a god.

In a small number of passages the same spelling carries a completely different meaning, and scholars trace it to a separate root that means to weave or to screen. Here the word is not an idol at all but a covering: a shroud, a veil, or a blanket spread over something.

The two clearest cases are both in Isaiah. One pictures a covering draped over all the nations, an image of death and mourning that God promises to strip away. The other is a proverb about a blanket too short to wrap yourself in, mocking a false sense of security. In neither place does anything molten fit; the point is a cloth that covers or fails to cover.

Because the two words look and sound identical, Isaiah at times seems to play on the overlap on purpose, letting a hearer catch echoes of both the poured idol and the spread-out covering at once.