投 - throw, discard, abandon

mailing; posting

absentee ballot; absentee voting

projection

stone throwing

abandonment; giving up; throwing away; disposal; dumping

investment trust

relieving the (starting) pitcher

pitching duel; pitchers' battle

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

investment

administration; medication; dosage

underhand throw