fall in with

English

fall in with (third-person singular simple present falls in with, present participle falling in with, simple past fell in with, past participle fallen in with)

To join (a group of people).
He has fallen in with a bad lot.
To meet with (something).
- 1846, Frederick Marryat, “chapter 4”, in The Privateersman, or One Hundred Years Ago:
  We had not sailed twelve hours before we fell in with a gale, which lasted several days, and we kept under close-reef-topsails and storm-staysails.
To accept, abide by (a set of generally agreed rules, or a suggestion).
It seemed like a good idea, so we fell in with it.