ちりも積もれば山となる
Idiom- 1many a little makes a mickle ; every little helps ; even dust becomes a mountain if piled together Translated by Jiyomi
Other writings and readings
塵も積もれば山となる塵も積もれば山と成る
expressions (phrases, clauses, etc.) · Godan verb with 'ru' ending
JMdict entry 2418420. Source and licence.