滚刀

滚刀	gǔn dāo	(engineering) gear hob (cutting tool used in manufacturing gears)
滚	gǔn	to boil / to roll / to take a hike / Get lost!
刀	Dāo	surname Dao
刀	dāo	knife; blade; single-edged sword; cutlass (CL:把) / (slang) (loanword) dollar / classifier for sets of one hundred sheets (of paper) / classifier for knife cuts or stabs / (Internet slang) to bargain; to ask for a small discount (esp. on second-hand marketplaces)