HSK 7-9
耳光
ěrguāng名
a slap on the face
他因冲动打了对方一耳光。
Tā yīn chōng dòng dǎ le duì fāng yì ěr guāng.
In a moment of impulse, he slapped the other person.
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Appears across levels (7-9) in the HSK 3.0 word list.