(idiomatic) Phrased simply, without jargon.

(idiomatic) To go to a bad state of affairs quickly.

present participle of check in

The act of checking in at a hotel, airport, etc. / (computing) The submission of source code or other material to a source control repository.

To announce or record one's own arrival at a hotel, airport etc. / To verify a person's information and record their arrival, such as at a hotel, airport, etc.

(slang) Belonging to a management level, as in a contemporary office hierarchy.

(operations) Of a manufacturing system in which components are delivered at the precise time required, thus minimizing inventory carrying costs.

A means of execution or of euthanasia in which a person is injected with a fatal dose of drugs.

A moment (of time).

Without any clothing on.