If and when
Definition 1 of 1
Pro Tip 1/3Conditional Future
Indicates an event will happen only when certain conditions are met in the future. 
We’ll discuss the contract if and when we receive the necessary approvals.
Pro Tip 2/3Uncertain Timing
Reflects uncertainty about when something will occur, but assumes it eventually will. 
I'll think about selling my bike if and when I move to a smaller apartment.
Pro Tip 3/3Event Dependency
Use it to show that one action depends on the occurrence of another event. 
The trip will be canceled if and when the storm hits the coast.