山やまを成なす

expression, godan verb (-su)

pile up; form a huge pile

Describes things accumulating into a large heap, often used for physical objects like books, snow, or garbage. The phrase emphasizes the size or abundance of the pile.

• 机つくえの上うえに書しょ類るいが山やまをなしている。

  Documents are piled up on the desk.

• 雪ゆきが山やまをなして積つもった。

  The snow piled up into a huge mound.