杠刀

to sharpen a knife (or razor etc)

flagpole / footbridge

variant of 槓|杠[gang4]

coffin-bearing pole (old) / thick pole / bar / rod / thick line / to mark with a thick line / to sharpen (a knife, razor etc) / to get into a dispute with / standard / criterion

knife / blade / single-edged sword / cutlass / CL:把[ba3] / (slang) dollar (loanword) / classifier for sets of one hundred sheets (of paper) / classifier for knife cuts or stabs