(亦作pein)
- the end of a hammer head opposite the face, typically wedge-shaped, curved, or spherical（尤指楔形、曲线形或球形的）锤顶。
词源
early 16th cent. (as a verb)： probably of Scandinavian origin; compare with Swedish dialect pena（ut）, Danish dialect pene（ud） 'beat (out)'.