冷水

1. Origins, structure, and basic meaning

• Structure: 冷水 (れいすい) combines cold 冷 and water 水 to denote cold water.
• Basic usage: It is used for washing after exercise or for water cold enough to startle the hands.

2. Common pitfalls and similar expressions

• Cold water does not require ice
  • 冷水 specifies low temperature, but it does not necessarily contain visible ice cubes.