Definition of “call-in” - English Dictionary

“call-in” in British English

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call-innoun [ C ]

uk /ˈkɔːl.ɪn/ us /ˈkɑːl.ɪn/ US UK phone-in

(Definition of “call-in” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“call in” in American English

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call in

phrasal verb with call us /kɔl/ verb

(PHONE)

to telephone the place you work:

She hasn't called in with her schedule yet.

You can also call in to a radio or television program or to an organization asking for information from the public:

Call in to this radio station and ask the governor a question.
People were calling in to report suspicious activity.
call in sick

If you call in sick, you telephone to say that you are unable to work because of illness.

call-inadjective [ not gradable ]

us /ˈkɔlˌɪn/

(of broadcasts) allowing members of the public to make their questions and opinions a part of the program:

Bell hosts a popular call-in show on a local radio station.

(Definition of “call in” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“call in” in Business English

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call in

phrasal verb with call uk /kɔːl/ us verb

[ I ] COMMUNICATIONS to phone a place in order to give or get information:

With a number of employees having called in sick, the remaining staff were struggling to cope.
People were asked to call in if they wanted further information on the proposal.

(Definition of “call in” from the Cambridge Business English Dictionary © Cambridge University Press)