1. Noun, Suru verb, Transitive verb

   1.

   throwing in; inserting; depositing (e.g. a ballot)

2. 2.

   investment; commitment (of funds, personnel, etc.); injection; infusion

3. 3.

   launching (a product into the market); introduction

Example sentences

• 敵は新兵力を投入した。

  The enemy flung fresh troops into the battle.

• 道を平らにするのにブルドーザーが投入された。

  A bulldozer was brought in to make the road flat.