be/keep in with somebody

be in with (someone)

1. To be in close association with someone or some group. I'm worried about Johnny—I think he's in with a dangerous group of people. I wish I were in with my brother's friends—they're all so cool!
2. To have a friendly relationship with a powerful or important person and, usually, benefit from it in some way. Now that I'm in with the CEO, I'm sure I can get you a job at our company.

keep in with (someone)

1. To attempt to maintain a friendly relationship with someone, especially if that person may be of some benefit or help. I've tried to keep in with the managing editor from my previous job, as she has a lot of useful business contacts from across the state.
2. To remain in agreement or accordance with something; to be consistent with something. Despite comprising nearly all new members, the long-running band's latest album really keeps in with the sound and energy of their early recordings. The new extension they built keeps in nicely with the original design of the building. The new policy is expected to keep in with the agenda of the previous administration.
See also: keep
Farlex Dictionary of Idioms.

keep someone or something in with someone or something

to locate people or things together, in any combination. I will keep Tom in with me until he gets his own room. We will keep the cat in with Tom until there is room elsewhere.
See also: keep
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

be/keep (well) ˈin with somebody

(informal) be friendly with somebody, not because you like them, but because they may be useful to you: If you want to do well in this company, keep well in with the boss.
See also: keep, somebody
Farlex Partner Idioms Dictionary
See also:
  • be in with (someone)
  • in with, be
  • in contact
  • member
  • paid-up member (of something)
  • card-carrying member
  • a card-carrying member (of something)
  • a paid-up member, etc.
  • ginger group
  • make a hit with