回信 (huí xìn) means “to reply; to write back; letter written in reply”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
Measure word: 封
Practice each character:
请尽快给我回信。
Qǐng jǐnkuài gěi wǒ huíxìn.
Please reply to me as soon as possible.
Updated: 2026-07-18