投じる， とうじる
1. to throw, to cast (e.g. vote, light, shadow)
2. to devote oneself (e.g. to a cause)
3. to invest, to put in
4. to administer (medicine), to give
5. to abandon, to surrender
6. to take advantage of, to make full use of
7. to fit well with, to match...
tbd