fellow pilgrim; fellow practicer of austerities
「同行」 has another reading with different meanings.
同行者と一緒に祈りを捧げた。
I offered prayers with fellow pilgrims.
同行の仲間と経験を共有した。
I shared experiences with fellow practitioners.
同行して修行に励むことにした。
I decided to practice austerities with fellow pilgrims.