razor strop; hone
A strip of leather or other material used to sharpen and polish straight razors.
祖父は毎朝、剃刀砥で剃刀を研いでいた。
My grandfather used to sharpen his razor on a strop every morning.
Compound of 剃刀 (かみそり, 'razor') and 砥 (ど, 'whetstone' or 'hone'). The reading ど is the rendaku form of と.