出差 (chū chāi) means “to go on an official or business trip”. It is an HSK 4 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
他经常出差去上海。
Tā jīngcháng chūchāi qù Shànghǎi.
He often travels to Shanghai on business.
Updated: 2026-05-27