noun, noun or participle which takes 'suru', transitive verb
dropping; airdrop; throwing down
Physical act of dropping something from above, especially from an aircraft. Also used for dropping supplies, bombs, or leaflets.
被災地に救援物資を投下した。
They dropped relief supplies to the disaster area.
敵陣にビラを投
An operation to drop leaflets over enemy lines.
noun, noun or participle which takes 'suru', transitive verb
investment; injection of capital
Metaphorical extension: putting money, resources, or effort into something. Common in economic and business contexts.
政府は景気対策に巨額の資金を投下した。
The government injected a huge amount of funds into economic measures.
新事業に資本を投下する。
They invest capital in a new business.