take up with
• begin to associate with someone, especially in a way disapproved of by the speaker.
• "he soon took up with a rough crowd and began to drink, smoke, and gamble"
Similar:
become friendly with,
become friends with,
go around with,
go along with,
fall in with,
join up with,
string along with,
get involved with,
start seeing,
knock about with,
knock around with,
hang around/out with,
hang about with,