At a pinch
Definition 1 of 1
Pro Tip 1/3Emergency Substitute
Use it when something else can work temporarily when the usual option isn't available. 
I forgot my textbook but I can use his notes at a pinch.
Pro Tip 2/3Slight Discomfort
It implies the alternative is acceptable, though not ideal or may come with minor issues. 
We can sleep on the floor at a pinch if there are no beds.
Pro Tip 3/3Not Preference
Emphasizes that the option is a backup, not something you would normally choose. 
He's not my favorite actor, but he'll do at a pinch.