遊ぶ

to play (games, sports); to enjoy oneself; to have a good time

to mess about (with alcohol, gambling, philandery, etc.)

to be idle; to do nothing; to be unused

to meet up (with friends); to hang out

to give oneself up (to gambling, drinking, etc.)

to go to (for pleasure or for study)

as 〜に遊ぶ

to tease (someone); to play (with)

to intentionally throw a ball to lower the batter's concentration