hang out 
phrasal verb with hang verb uk/hæŋ/ us/hæŋ/
  informal      
B1 经常出入(某场所);(与某人)厮混
to spend a lot of time in a place or with someone
  You still hang out at the pool hall? 你仍然经常出没于台球厅吗? 
 I've been hanging out backstage with the band. 我常在后台与乐队混在一起。 
 - More examples
 - They spent the whole day hanging out by the pool.
 - I don't know why he hangs out with James, they've got nothing in common.
 - Haven't you got anything better to do than hang out at the shopping centre?
 - They enjoyed hanging out with each other when they were kids.