on the anvil

Prepositional phrase

idiomatic

(idiomatic) In a state of discussion, formation, or preparation; not yet matured.

Japanese Meaning

議論中の状態（検討や形成、準備が進行中で、まだ成熟していない状態） / 形成中または準備段階にある状態 / まだ完成されていない、発展途上の状態

Plans to expand the park are on the anvil and should be finalized by next spring.

公園の拡張計画は検討中で、来年の春までに最終決定される見込みです。

Sense（1）

(idiomatic) In a state of discussion, formation, or preparation; not yet matured.

I have several things on the anvil, and near finished, that perhaps might be useful if published