on-call

🔊/ˌɒn ˈkɔːl/

🔊/ˌɑːn ˈkɔːl/

[only before noun] (especially North American English)

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(of a doctor, police officer, etc.医生、警察等) available for work if necessary, especially in an emergency（尤指紧急情况下）随叫随到的
- on-call doctors随时应诊的医生
see also call