0 something that has a sudden and positive effect on something, providing encouragement and new activity:
Fresh investment would provide the shot in the arm that this industry so badly needs.
1 something that has a sudden, strong, positive effect on something:
Winning this award has been a big shot in the arm for the students.
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
a shot in the arm