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が山積み

… are piled up

→ が
phrase Rare #36,273
… are piled up Often used figuratively to say there is a large amount of something, especially work or tasks. が marks what is piled up.
JA: 机の上に書類が山積みだ。
EN: Documents are piled up on the desk.

やらなければいけないことが山積みなんだ。

I have a mountain of things I need to do.

まだやることが山積みだよ。

I still have a mountain of things to do.

テーブルの上に手紙が山積みになっている。

Letters are piled up on the table.

書類が山積みで何かお手伝いしましょうか？

You have a mountain of paperwork. Can I help with anything?

— レベッカ (1940)