a shot in the armCONFIDENTsomething that makes you more confident or more successful 鼓舞人心的事情，强心针 The new factory will give the local economy a much-needed shot in the arm. 这家新工厂将会为当地的经济注入迫切需要的一针强心剂。
a shot in the arm• The new factory will give the local economy a real shot in the arm.• Coming back will be a shot in the arm.• In 1922 it received a shot in the arm through a large subsidy from the Central Committee.• It now had the effect of a shot in the arm.• It was like a shot in the arm for us, and our tiredness fell away.• On the Conservative side, the decision of Callaghan not to hold an election came as a shot in the arm.
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