約束

1. Origins, structure, and basic meaning

• Structure: Written 約束 and read やくそく, it is a commitment made to another person about a future action or restraint.
• Basic usage: It is made to play together on Sunday and treated as worth keeping even when small.

2. Common pitfalls and similar expressions

• Commitment rather than private plan
  • Because it is given to someone, it creates an expectation and responsibility grounded in trust.