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on call
Available if summoned, as in Medical residents are required to be on call at least three nights a week. This expression originated as at call in the late 1500s. Also see at someone's beck and call.
Example Sentences
He was the consultant on call on her ward on 29 August 2021 - two days before she died.
The area's sole, permanent doctor, she spent years essentially on call 24/7.
She is sometimes on call from 4am to 9pm, driving from one patient's home to another, but gets paid only for the few hours she is actually with the patient, and not the full shift.
Pro bono attorneys are on call to offer legal support to congregations in case of immigration raids, Torres said.
They always need to be on call because, according to Muslim rites, a burial must be organised within a few hours of someone's death.
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