1. to throw; to cast (e.g. vote, light, shadow)
そして、彼女は微妙に鋭い視線を部屋の中に投じていた。And she was casting a subtly sharp gaze into the room.
2. to devote oneself (e.g. to a cause)
in the form of 身を投じる
再び、この身を戦いの中へ投じることになる。Once again, I will throw myself into battle.
3. to invest; to put in
お金を投じてみるのも良いかも知れません。It might be good to try investing money.
4. to administer (medicine); to give
Verb (1-dan, intransitive)
5. to abandon; to surrender
6. to take advantage of; to make full use of
7. to fit well with; to match with; to be in tune with
8. to stay (at a lodging)