HSK7-9
cuō
polish
Phonosemantic compound. 石 represents the meaning and 差 represents the sound.
石 Meaning component
shí, dàn
stone
差 Sound component
chà, chā, chāi
to differ
磋
polish, buff; scrutinize; deliberate; to polish
deliberate
切磋
to compare notes
磋商
to consult
切磋琢磨
lit. cutting and polishing (idiom)
Make Me a Hanzi
Unicode
Baxter-Sagart
Dong Chinese
CC-CEDICT
SUBTLEX-CH
MTSU Chinese text computing