祝う

1. Origins, structure, and basic meaning

• Structure: 祝う, read いわう, joins the celebration stem 祝 with the verb ending う.
• Basic usage: Use it for commemorating a happy occasion or good result, as in 誕生日を祝う.

2. Common pitfalls and similar expressions

• Grammar and combinations
  • The celebrated occasion takes を; the construction differs from directly saying congratulations with おめでとうと言う.