打磨

打磨	dǎ mó	to polish; to burnish; to shine
打	dá	(loanword) dozen / Taiwan pr. [da3]
打	dǎ	to beat / to strike / to hit / to break / to type / to mix up / to build / to fight / to fetch / to make / to tie up / to issue / to shoot / to calculate / to play (a game) / since / from
磨	mó	to rub / to grind / to polish / to sharpen / to wear down / to die out / to waste time / to pester / to insist
磨	mò	grindstone / to grind / to turn round