on call

on call

Ready or available when and if needed. We have a team of engineers on call if you experience any issues. I'm on call with the hospital, so I can't drink tonight.
See also: call, on
Farlex Dictionary of Idioms.

on call

ready to serve when called. I live a very hard life. I'm on call twenty hours a day. I'm sorry, but I can't go out tonight. I'm on call at the hospital.
See also: call, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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.
See also: call, on
The American Heritage® Dictionary of Idioms by Christine Ammer.

on ˈcall

(of a doctor, etc.) available for duty if needed: Our qualified staff are on call 24 hours a day should you need any technical support.
See also: call, on
Farlex Partner Idioms Dictionary

on call

1. Available when summoned for service or use: physicians who were on call for 48 hours.
2. Subject to payment on demand.
See also: call, on
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • Can I have (one) call you?
  • Could I have call you?
  • call in (one's) marker
  • marker
  • call about
  • call about (something)
  • issue a call for
  • issue a call for (something)
  • last call
  • final call