九層 きゅうそう うてな累土 るいどより こる
kyūsōno utenawa ruidoyori okoru

Godan Verb (ru)
Expression

1. many a little makes a mickle; every little helps; the tower of nine storeys (stories) rose from a small heap of earth — literal

Rare
Proverb
Related to ちりも積もれば山となる