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Definition of on-call adjective from the Oxford Advanced Learner's Dictionary

on-call

adjective
 
/ˌɒn ˈkɔːl/
 
/ˌɑːn ˈkɔːl/
[only before noun] (especially North American English)
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  1. (of a doctor, police officer, etc.) available for work if necessary, especially in an emergency
    • on-call doctors
    see also call
trait
noun
 
 
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B2
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