出行 chūxíng to go out somewhere (relatively short trip)

to go out somewhere (relatively short trip); to set off on a journey (longer trip)

How to remember 出行: 出 go out + 行 go = to go out somewhere (relatively short trip).

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A somewhat formal/written word for "to travel, to go out (on a trip)" - 出行方式 (chūxíng fāngshì) mode of travel/transportation, a common phrase in news and transit apps.
Covers both short trips (running errands) and longer journeys, unlike English which usually needs different words.
In casual daily speech, people just say 出去 (chūqù) go out or 旅行 (lǚxíng) travel; 出行 shows up more in official contexts like traffic reports and holiday travel advisories.