青筋

青筋	qīng jīn	veins / blue veins
青	Qīng	abbr. for 青海, Qinghai Province
青	qīng	green / blue / black / youth / young (of people)
筋	jīn	muscle / tendon / veins visible under the skin / sth resembling tendons or veins (e.g. fiber in a vegetable)