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*in (good) with (someone)
in someone's favor. (*Typically: be ~; get ~.) hope I can get in good with the teacher. I need an A in the course. Mary is always trying to get in with the people who are in charge.
*in with someone
favored by someone; experiencing someone's goodwill. (*Typically: be ~; get ~.) I'm really in with my Spanish professor. I am trying to get in with the bank manager so I can get a loan. Are you in with John? I need to ask him for a favor.
in withenjoying friendly relations with. informal
1990 Jeffrey Masson Final Analysis I was in demand everywhere…simply because I was in with the right people.
In league or association with: He is in with the wrong crowd.