" A shot in the arm "
Meaning:
A boost or encouragement.
Example:
I was out on my feet after ten miles’ running but seeing the kids cheering me on was a real shot in the arm.
Where did it originate?:
USA, initially alluding to a shot of drugs but now used without that connotation.
Where is it used?:
Worldwide, very commonly used.
Hear the idiom spoken: