on call Meaning in the Cambridge English Dictionary
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Meaning of “on call” in the English Dictionary

"on call" in British English

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on call

If a ​worker such as a ​doctor is on call, he or she is ​available to ​work or make ​officialvisits at any ​time when ​needed: She's a ​doctor, so she's often on call at the ​weekend.
See also

on-calladjective [before noun]

uk   us  
used to ​describeworkers who are ​available to make ​officialvisits at any ​time when they are ​needed: an on-call ​specialist/​firefighter/​judge relating to the ​work of someone who is ​available at any ​time when ​needed: My new ​job is 20 ​hoursperweek, with no on-call ​work.
(Definition of on call from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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