tighten · conclude

1. Origins, structure, and basic meaning

• Structure: 締 has 15 strokes and expresses tightening or bringing something to a close.
• Basic usage: 締まる is read しまる, and 締める is read しめる.

2. Common pitfalls and similar expressions

• Intransitive 締まる and transitive 締める
  • 締まる is intransitive and describes something becoming tight or tense.
  • このねじは右に回すと固く締まる。 means “Turning this screw clockwise tightens it firmly.”
  • 締める is transitive and describes tightening an object or closing an event.
  • 箱が開かないようにひもを強く締めた。 means “I tightened the cord so the box would not open.”