投了

1. Origins, structure, and basic meaning

• Structure: 投了 is read as とうりょう and can mean “resignation from a game” or “concession”, depending on context.
• Basic usage: The examples show a player conceding a hopeless game and the opponent responding to that resignation.

2. Common pitfalls and similar expressions

• Distinguishing senses and uses
  • It is voluntarily conceding defeat to end a board game, distinct from losing on time or by a rules violation.