二日酔い

1. Origins, structure, and basic meaning

• Structure: 二日酔い means a hangover: discomfort remaining into the day after drinking.
• Basic usage: It is used to describe situations such as a morning headache after drinking too much the night before.

2. Common pitfalls and similar expressions

• Reading of 二日
  • Here 二日 is read ふつか; with 酔い, it becomes ふつかよい. It names a hangover rather than measuring a duration of exactly two days.