He fell in with bad company and started getting into trouble.
good company
Frequency:
60
%
She was lucky to fall in with good company while traveling.
the wrong crowd
Frequency:
50
%
She warned him about falling in with the wrong crowd.
a group
Frequency:
45
%
He fell in with a group of artists who inspired his creativity.
Idiomatic Expressions for fall in with
Phrase: fall in with
Meaning: to agree with or conform to something
Usage: He didn't initially like the idea, but eventually fell in with the rest of the team's plan.