N (on a piano, harp, etc) a pin around which one end of a string is wound: it may be turned by means of a tuning key to alter the tension of the string. In a piano the wrest pin is embedded in the wrest plank 校音栓
N（名词） (on a piano, harp, etc) a pin around which one end of a string is wound: it may be turned by means of a tuning key to alter the tension of the string. In a piano the wrest pin is embedded in the wrest plank 校音栓