磨 + 成 + Result / 磨 + Object
The verb 磨 (mó, second tone) means "to grind," "to polish," or "to sharpen" through friction or abrasion. It is used for actions like sharpening a knife, polishing a surface, or grinding something into fine particles by rubbing.
他正在院子里磨刀呢。
tā zhèngzài yuànzi lǐ mó dāo ne.
He's sharpening a knife in the yard.
这块玉需要反复打磨才能变得光滑。
zhè kuài yù xūyào fǎnfù dǎmó cái néng biàn de guānghuá.
This piece of jade needs to be polished repeatedly to become smooth.
你把这块木板再磨一磨,表面就平了。
nǐ bǎ zhè kuài mùbǎn zài mó yī mó, biǎomiàn jiù píng le.
Sand this wooden board a bit more and the surface will be smooth.