含み笑い

1. Origins, structure, and basic meaning

• Structure: Written 含み笑い and read ふくみわらい, it means a restrained laugh that seems to conceal some private meaning.
• Basic usage: It fits a knowing expression or a smile that hides a joke.

2. Common pitfalls and similar expressions

• More than a simple smile
  • It suggests an unspoken thought or implication rather than uncomplicated pleasure.