Her hair was like a waterfall cascading down.
Meaning: This means that the hair was long, flowing, and beautiful, like a waterfall.
Choice of Words: Waterfall means a natural stream of water falling from a high place, like a cliff or a mountain. Cascading means flowing or falling in a series of steps or stages. When you put them together, "waterfall cascading down" means that the hair was flowing down like a waterfall, in a series of steps or stages.
Alternative Expressions
Related Expressions