noun
all honors; winning hand of only honor tiles
A mahjong yaku (winning hand) consisting entirely of honor tiles (winds and dragons).
from Chinese zì yī sè
字一色は役満の中でも特に派手な手役だ。
All honors is a particularly flashy yakuman hand.
彼は字一色をテンパイして、見事に和了った。
He was tenpai for all honors and won the hand brilliantly.
清一色 is a full flush (one suit only), whereas 字一色 uses only honor tiles.
From Chinese 字一色 (zì yī sè), literally 'characters one color', referring to a hand composed entirely of honor tiles.