一対

1. Origins, structure, and basic meaning

• Structure: 一対, read いっつい, denotes two corresponding items that together form a matched pair.
• Basic usage: It counts two corresponding items, such as statues on either side of a gate or matching earrings.

2. Common pitfalls and similar expressions

• Two items forming one pair
  • More than merely “two,” it emphasizes that the items correspond in side, function, or form as one set.