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English definition of “on-call”

on-call

adjective [before noun] uk   us  
used to describe workers who are available to make official visits 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: The overnight on-call payment is just £5.95 an hour. My new job is 20 hours per week, with no on-call work.
(Definition of on-call adjective from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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