(bound form) to polish or grind bone, horn, or ivory into tools or ornaments; to polish or smooth a surface

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

(bound form) to deliberate; to consult or discuss repeatedly, as in 磋商 cuō​shāng or 切磋 qiē​cuō

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

(bound form) to polish or grind bone, horn, or ivory into tools or ornaments; to polish or smooth a surface

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