Press somebody/something into service
Definition 1 of 1
Pro Tip 1/3Urgent Situations
This phrase often implies a situation requiring immediate action where no better options are available. 
When the power went out, we pressed candles into service to light the room.
Pro Tip 2/3Unplanned Usage
The phrase suggests using someone or something in a way that wasn't originally intended or planned. 
We pressed the conference room into service as an emergency shelter.
Pro Tip 3/3Temporary Solution
It implies that the service is a makeshift or temporary solution, not a permanent one. 
The old van was pressed into service as a delivery vehicle while the new one was being repaired.