The Chinese word for to smile is
微笑

wēi xiào

Chinese Definition

smile
1. 名词. 微笑。
2. 动词. 微笑。
Components
微
1. tiny; small; trifling
2. to decline; to deteriorate
3. humble; low-ranking
4. slight; gentle
5. slightly; gently
6. micro- (SI unit prefix)
7. (Chinese linguistics) the Middle Chinese initial of 微
8. (telegraphy) the fifth day of a month
9. (mouth, eyes, etc.) to close slightly
10. a little
笑
1. (intransitive) to laugh; to smile
笑容 - smile
唔識笑 - never smiles
2. to laugh at; to ridicule
點解你哋成seng4日笑我㗎？ - Why do you guys always laugh at me?
3. (ditransitive) to laugh at; to ridicule
笑佢唔識講廣東話waa6-2 - to make fun of them for not knowing how to speak Cantonese
4. (literary, or in compounds) funny; amusing
笑話 - joke, lit=funny words
5. (obsolete, figurative) to blossom; to bloom
6. (rare)

笑
1. (intransitive) to laugh; to smile
笑容 - smile
唔識笑 - never smiles
2. to laugh at; to ridicule
點解你哋成seng4日笑我㗎？ - Why do you guys always laugh at me?
3. (ditransitive) to laugh at; to ridicule
笑佢唔識講廣東話waa6-2 - to make fun of them for not knowing how to speak Cantonese
4. (literary, or in compounds) funny; amusing
笑話 - joke, lit=funny words
5. (obsolete, figurative) to blossom; to bloom
6. (rare)