Verb
To join (a group of people).
He has fallen in with a bad lot.
To meet with (something).
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.
It is better to fall in with crows than with flatterers; for in the one case you are devoured when dead, in the other case while alive. Antisthenes
Always fall in with what you're asked to accept. Take what is given, and make it over your way. My aim in life has always been to hold my own with whatever's going. Not against: with. Robert Frost
Russian Parliament today is a bunch of puppets that just fall in with the instructions from Kremlin. Garry Kasparov
Following on a whim a sign advertising a "flying saucer symposium", Paul and Margo fall in with a group of intellectuals, dreamers, charlatans and misfits. Source: Internet
The Pastoral Peregrinations Sancho and Don Quixote fall in with a group of goatherders. Source: Internet
You will attack and destroy any force you may fall in with on the road." Source: Internet