What would, or will, happen if; what is the difference if; suppose that. What if you go instead of me? What if we paint it red. How will it look? "You can't go now" said mother. "What if I do?" Dick asked. What if Jack scores a touchdown?
WHAT IF
Meaning of WHAT IF in English
American idioms English vocabulary. Английский словарь американских идиом. 2012