投とう下か

と

う

か

Common wordFreq.FrequencyTop 10,000

投下する · noun or participle which takes 'suru'

Meanings

dropping; airdrop; throwing down

Physical act of dropping something from above, especially from an aircraft. Also used for dropping supplies, bombs, or leaflets.

investment; injection of capital

Metaphorical extension: putting money, resources, or effort into something. Common in economic and business contexts.

〈物もの〉を投とう下かするto drop something (e.g. bombs, supplies) from above
飛ひ行こう機きから救きゅう援えん物ぶっ資しを投とう下かした。
Relief supplies were airdropped from the plane.
資し金きんを投とう下かするto inject funds (into a project or business)
新しん事じ業ぎょうに大たい量りょうの資し金きんを投とう下かした。
A large amount of funds was invested in the new business.
〈場ば所しょ〉に投とう下かするto drop something onto a particular place
軍ぐんは敵てき地ちに爆ばく弾だんを投とう下かした。
The military dropped bombs on enemy territory.
巨きょ額がくの〈物もの〉を投とう下かするto pour a huge sum (of money, resources) into something
政せい府ふは復ふっ興こうに巨きょ額がくの予よ算さんを投とう下かした。
The government poured a huge budget into the reconstruction.

投とう資しN2sense 2
投資 is the everyday term for financial investment, while 投下 emphasizes the large-scale or strategic act of pouring resources into something.
投とう擲てき sense 1
投擲 is a literary word for throwing or hurling something, while 投下 specifically implies dropping from above, often from an aircraft.
出しゅっ資し sense 2
出資 focuses on contributing capital to a business venture, while 投下 more broadly covers putting in money, resources, or effort.

落らっ下かN1sense 1
落下 describes something falling on its own (intransitive), whereas 投下 is the transitive act of dropping something deliberately.
投とう函かん
投函 means to mail a letter by putting it in a mailbox, which learners can confuse with 投下 due to the similar spelling and reading.

Compound of 投 (throw) and 下 (down). The investment sense is a metaphorical extension of 'throwing down' capital.