投 - throw, discard, abandon

mailing; posting

overhand throw

projection

stone throwing

abandonment; giving up; throwing away; disposal; dumping

throw; throwing

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

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