deliver · reach

1. Origins, structure, and basic meaning

• Structure: 届 conveys delivering or reaching; its kun-readings are とどける and とどく.
• Basic usage: 届ける(とどける) means to deliver or turn in a found item, while 届く(とどく) means to arrive or reach.

2. Common pitfalls and similar expressions

• The act of delivering and arrival or reach
  • 荷物を祖父の家へ届ける means to deliver a package to one's grandfather's home. 荷物が届きました means a package arrived, distinguishing the act of delivery from the package's arrival.
  • 手が届かない means one's hand cannot reach. 届く is used for reaching a shelf as well as for mail arriving.