定弦

定弦	dìng xián	tuning (stringed instrument) / (fig.) to make up one's mind
定	dìng	to fix; to set; to make definite / to subscribe to (a newspaper etc); to book (tickets etc); to order (goods etc) / to congeal; to coagulate / (literary) definitely
弦	xián	bow string / string of musical instrument / watchspring / chord (segment of curve) / hypotenuse / CL:根