倦まず弛まず | [うまずたゆまず, umazutayumazu] (exp) tirelessly; perseveringly; without letting up [Add to Longdo] |
知恵の輪 | [ちえのわ, chienowa] (n) (1) puzzle ring; wire puzzle; (2) exercise where students link crossed hands in a circle and try working together and without letting go [Add to Longdo] |