pair

1. Origins, structure, and basic meaning

• Structure: 双 expresses two forming a pair; its on-reading is そう and its kun-reading is ふた.
• Basic usage: 双子, read ふたご, means twins; 双方, read そうほう, means both parties or sides.

2. Common pitfalls and similar expressions

• Two people and two sides
  • 双子 refers to two people who are twins. 双方 refers to the two sides in a discussion or contest, so each side may include more than one person.