“A molten calf”
With an engraving tool he fashioned it into a molten calf. And they said, 'These, O Israel, are your gods, who brought you up out of the land of Egypt!' (Exodus 32:4 BSB)
What it sounds like today
The people simply swap God for a shiny idol of a cow.
The cultural key
The bull or calf was everywhere in the ancient Near East a symbol of power and fertility, and gods were often depicted standing on the back of a bull. Strikingly, the people do not clearly rename their god; the next verse calls it 'a feast to the LORD.' The sin, then, is not obviously trading God for a rival but worshiping the true God in the forbidden visual language of Egypt and Canaan, reducing the invisible LORD to a manageable image. Jeroboam later repeats the exact move with two golden calves.
Recovered meaning
The scandal is not only idolatry but domestication: the God who has no image is recast as a familiar bull-god the people can see and control. It breaks the second commandment barely spoken, worshiping the right God the wrong way.