on standby

ready for use เตรียมพร้อม, สำรอง

Government agencies will be on standby for possible flooding in the city's at-risk areas until tomorrow.

The mobile phone signal will automatically link to the emergency centre where officials are on standby 24 hours a day.

One of the rental shops opposite the park's main entrance also has a worker carrying red flags on standby to stop the traffic when biking tourists want to cross the road.