to rub; to grind; to polish; to sharpen; to wear down; to press against another object

hardship; suffering; a period of difficulty that tests one's character; to endure or undergo training

to grind or mill grain into powder or paste

to dawdle; to waste time; to stall or delay

to pester; to bother; to annoy someone persistently; to trouble

a millstone; a device made of two stones used for grinding grain

to turn around or about; to change direction in a tight space

a Chinese surname