Deal somebody/something a blow
Definition 1 of 2
Pro Tip 1/3Negative Connotation
This phrase often implies unexpected or significant difficulties. 
The new tax laws dealt small businesses a severe blow.
Pro Tip 2/3Metaphorical Use
Commonly used to describe non-physical, abstract setbacks. 
Not getting the scholarship dealt her dreams a blow.
Pro Tip 3/3Not Literal
Don't misunderstand it as a physical action; it's sometimes metaphorical. 
The cancellation of the event dealt a blow to the community's spirit.