strop

strop
/strɔp; strɑp/ n
leather strap on which a razor is sharpened, or a machine used for the same purpose 磨剃刀的皮带或机器. strop, v (-pp-) [Tn]
sharpen (a razor) on a strop 在皮带或打磨机上磨（剃刀）.

牛津英汉双解词典