1.
going, outward journey
The journey toward a destination, as opposed to the return trip.
2.
bound for
Used as a suffix on signs and announcements to indicate destination.
行き is a noun derived from 行く (to go), meaning the outward journey.
COMMON PATTERNS:
- 行きと帰り (going and returning)
- 行き帰り (round trip)
- ~行き (bound for ~)
AS SUFFIX:
- 東京行き (Tokyo-bound)
- 成田空港行き (bound for Narita Airport)
- 上り/下り (up/down trains, alternative for direction)
ANTONYM:
- 帰り (return, way home)