shot in the arm, a

a shot in the arm

1. Literally, an injection of drugs. This phrase can refer to both legal and illegal substances. Once the nurse gives you a shot in the arm, you'll feel better, I promise.
2. Something that revitalizes, reinvigorates, or encourages someone or something. The chief's unexpected praise really gave my floundering project a shot in the arm.
3. A drink of alcohol. After a long week like this, I need a shot in the arm—want to meet me at the bar?
See also: arm, shot

shot in the arm, a

A stimulus or booster, something vitalizing or encouraging, as in Getting a new concertmaster was a real shot in the arm for the orchestra. This colloquial expression alludes to a stimulant given by injection. [c. 1920]
See also: shot