The characters combine to create a powerful and literal image: “to throw a thousand pieces of gold in a single toss.” This perfectly captures the idea of spending a fortune on a whim.
The idiom 一掷千金 often carries a slightly negative or cautionary undertone in Chinese culture, which traditionally values thrift (节俭, jiéjiǎn) and careful financial planning. It's frequently used to describe the decadent lifestyles of fallen dynasties, corrupt officials, or reckless gamblers. The act of “throwing” (掷) money away is seen as a sign of disrespect for the hard work it took to earn it.
This reflects a cultural fascination with grand, dramatic gestures, even while simultaneously wagging a finger at the wastefulness involved. It speaks to the tension between valuing frugality and being awed by immense wealth and power.
In modern China, 一掷千金 is still very much in use, though it retains a slightly formal or literary feel. You'll often encounter it in:
Its connotation is primarily negative (wasteful, foolish) but can be neutral or even slightly admiring when describing someone's immense capacity to be generous or to make a bold, decisive investment.