投 - throw, discard, abandon

mailing; posting

throwing oneself (e.g. into the water to commit suicide)

projection

stone throwing

investment trust

good (nice) pitching

pitching duel; pitchers' battle

relieving the (starting) pitcher

contribution (to a newspaper, magazine, etc.); submission; post (on a blog, social media, etc.)

investment

administration; medication; dosage

pitching with all one's strength