彫心鏤骨 ちょうしんるこつ laborious work; lucubration; lucubrations; painstakingly polishing a piece of literary work n yoji Advanced ➥
仙骨 せんこつ sacrum; sacral bone n adj-no hermitry; appearance of a hermit; unworldliness; unusual physique; outstanding appearance n adj-no Advanced ➥