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Phrase(s): a shot in the arm
1. Lit. an injection of medicine. • The doctor administered the antidote to the poison by a shot in the arm. 2. Fig. a boost or act of encouragement. • The pep talk was a real shot in the arm for all the guys. • The good test grade was a shot in the arm for Gary. 3. Fig. a drink of liquor. • I could use a little shot in the arm. • How about a little shot in the arm, bartender?
McGrawhill's American Idioms And Phrasal Verbs