along the beach; along the shore
Describes movement or a path that follows the beach. Often used with verbs of motion like 歩く or 行く.
浜伝いに歩いて、隣の町まで行った。
I walked along the beach to the next town.
Compound of 浜 (hama, 'beach') and 伝い (zutai, 'along'). The reading はまづたい reflects rendaku voicing of つたい.