grinder
/ˈgraɪndə(r); `ɡraɪndɚ/ n
1 thing that grinds, eg a molar tooth; apparatus for grinding 起研磨作用之物（如臼齿）; 研磨的装置; 研磨机
a `coffee-grinder 磨咖啡机.
2 (in compounds 用以构成复合词) person who grinds 做研磨工作的人; 做摇转工作的人: a `knife-grinder
an `organ-grinder, ie sb who plays a barrel-organ.