ready and waiting

accident waiting to happen

A thing or situation which is almost certain to eventually lead to an accident.

ready or not

Determined, regardless of readiness or preparedness.

ready to roll

Of a person, machine, vehicle, or plan, fully prepared to begin functioning and operating.

ready up

to prepare for use, to get ready

rough and ready

Crude or unpolished, but still fit for use; good enough.

waiting game

A strategy or course of action in which one or more parties refrain from direct action until circumstances change in their favor.