ring in phrasal verb (see also ring)

1. British English to telephone the place where you work:
Jane’s rung in to say she’ll be late.
He rang in sick (=telephoned to say he was ill) every morning for a week.

2. ring in the New Year to celebrate the beginning of the New Year

[TahlilGaran] Dictionary of Contemporary English ▲

ring in
v. phr., informal
1. To bring in (someone or something) from the outside dishonestly or without telling; often: hire and introduce under a false name.
Bob offered to ring him in on the party by pretending he was a cousin from out of town.
No wonder their team beat us; they rang in a professional to pitch for them under the name of Dan Smith.
2. To ring a special clock that records the time you work.
We have to ring in at the shop before eight o'clock in the morning.

[TahlilGaran] English Idioms Dictionary ▲