1.
When a government or organization brings in a new law or system, they introduce it.
The government brought in a controversial law under which it could take any land it wanted.
= introduce
PHRASAL VERB : V P n (not pron) , also V n P
2.
Someone or something that brings in money makes it or earns it.
I have three part-time jobs, which bring in about £14,000 a year.
PHRASAL VERB : V P n (not pron) , also V n P
3.
If you bring in someone from outside a team or organization, you invite them to do a job or join in an activity or discussion.
The firm decided to bring in a new management team.
= call in
PHRASAL VERB : V P n (not pron) , also V n P