外出 (wài chū) means “to go out; to go away (on a trip etc)”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
Practice each character:
他外出办事还没回来。
Tā wàichū bànshì hái méi huílái.
He went out on business and hasn't returned yet.
Updated: 2026-07-18