Verb (5-dan, ぶ, intransitive)
1. to play (games, sports); to enjoy oneself; to have a good time
よく食べ、よく遊び、よく戦う！Eat well, play well, fight well!
2. to mess about (with alcohol, gambling, philandery, etc.)
3. to be idle; to do nothing; to be unused
4. to meet up (with friends); to hang out
たまには友達と遊んでこいよ。Go hang out with your friends once in a while.
5. to give oneself up (to gambling, drinking, etc.)
6. to go to (for pleasure or for study)
as 〜に遊ぶ
7. to tease (someone); to play (with)
8. to intentionally throw a ball to lower the batter's concentration