上弦

上弦	shàng xián	to wind up a watch, clockwork toy etc / to tighten the string of a bow, violin etc / first quarter (phase of the moon)
上	shǎng	used in 上声
上	shàng	(bound form) up; upper; above; previous / first (of multiple parts) / to climb; to get onto; to go up / to attend (class or university) / (directional complement) up / (noun suffix) on; above
弦	xián	bow string / string of musical instrument / watchspring / chord (segment of curve) / hypotenuse / CL:根