投じる|とうじるtoujiru[0]heiban (flat)

1. ichidan verb, transitive verbto throw; to cast (e.g. vote, light, shadow)
   圧倒的あっとうてき多数たすうがその残酷ざんこくな刑罰けいばつを廃止はいしすることに票ひょうを投とうじた。↗

   An overwhelming majority voted to abolish the brutal punishment.
2. ichidan verb, transitive verbto devote oneself (e.g. to a cause)in the form of 身を投じる
3. ichidan verb, transitive verbto invest; to put in
4. ichidan verb, transitive verbto administer (medicine); to give
5. ichidan verb, intransitive verbto abandon; to surrender
6. ichidan verb, intransitive verbto take advantage of; to make full use of
7. ichidan verb, intransitive verbto fit well with; to match with; to be in tune with
8. ichidan verb, intransitive verbto stay (at a lodging)

• Synonym投げるなげるNeutralThe everyday word for throwing; stresses the hand motion and is the most common choice in daily speech. Also means giving up.
• Synonym投ずるとうずるWrittenSame-meaning variant form of the headword, as in 「一票を投ずる」; slightly old-fashioned in feel. Both words belong mainly to written prose.
• Related投入とうにゅうNeutralPutting in funds, personnel or resources; stresses inserting something in, as in 「新製品を投入」.
• Related投下とうかWrittenWritten style: dropping from above — airdrops such as 「爆弾投下」 or committing capital; stresses releasing something downward.
• Related投射とうしゃWrittenWritten, technical term: projecting light onto something or casting an image; used in physics and psychology.
• Related投影とうえいNeutralProjection: a shadow or image falling onto a surface; stresses the image landing on the plane.
• Related放り投げるほうりなげるCasualColloquial: to toss something out or drop a task midway and leave it undone; stresses casting things aside and giving up.
• Related投擲とうてきWrittenWritten word for throwing, as in 「石を投擲する」; also names the track-and-field 「投擲種目」.
• Relatedぶん投げるぶんなげるCasualColloquial and coarse: to fling something with great force; stresses the violent throw.
• Antonym受け取るうけとるNeutralAntonym: to receive or accept what is offered — the counterpart to casting something out with 「投じる」.
• Antonym回収するNeutralAntonym: to recover or take back, the opposite of putting money in, as in 「資金を回収」.

Use 「投じる」 for putting in money, devoting oneself to a cause, or casting votes, as in 「私財を投じる」「一石を投じる」. For everyday throwing say 「投げる」, for putting in resources 「投入」, for airdrops 「投下」; 「投ずる」 is the same-meaning variant. The opposite of putting in is 「回収する」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. なげる。
2. （課題かだいなどを）提起ていきする。
3. 投入とうにゅうする。
4. 投獄とうごくする。
5. 光ひかりなどを投なげかける。
6. 放棄ほうきする。
7. 資力しりょく・労力ろうりょくなどをつぎ込こむ。
8. 薬くすりなどを投与とうよする。
9. 身みを入いれる。身みを置おく。
10. 乗のる。
11. 投宿とうしゅくする。
12. 投降とうこうする。
13. 一致いっちする。合あう。