on standby
成語所屬單字standby
on standby — 慣用語
1. ready to be used or to take action immediately if necessary. Can refer to people
1.慣用語
釋義
處於待命狀態；處於待機狀態；處於候補狀態
ready to be used or to take action immediately if necessary. Can refer to people, equipment, or electronic devices depending on context.
例句
The hospital has two ambulances on standby at all times during the holiday weekend.
Do not leave your laptop on standby overnight if you want to save battery life.