In mahjong, a pair of identical tiles; 'eyes' is the traditional English mahjong term for the pair needed to complete a winning hand.
from Chinese duì zi
If I had just one more pair, I could win.
This hand has too many pairs, making it difficult.
seven pairs; winning hand of seven pairs
Standard kanji spelling for the mahjong term; the reading is katakana-based from Chinese.
Katakana spelling is common in mahjong contexts and avoids the rare kanji.
Borrowed from Chinese 對子 (duì zi), meaning a pair or couple, used in mahjong terminology.