Take up with

I hear that John has taken up with Jane.

Frank is an older, middle-class Englishman who has taken up with Johnny, the youngish, married son of his cleaning woman. It is unclear if money changes hands, but Frank is always ready to help out Johnny when he needs it.

For although the Queen had ordered a little Equipage of all things neceſſary while I was in her Service, yet my Ideas were wholly taken up with what I ſaw on every ſide of me, and winked at my own Littleneſs as People do at their own Faults.

It seems, then, that automobiles and automobiling were on Walter Chrysler's mind for a long time before he took up with this legendary Locomobile

He took them up with him on his next trip to the mountains.

He took up painting with his wife.

He took up the overpayment with his supplier.