booster
boost·er / ˈboōstər/ • n. 1. a person or thing that helps increase or promote something, in particular: ∎ a keen promoter of a person, organization, or cause: [as adj.] athletic booster clubs. ∎ a source of help or encouragement: job fairs are a great morale booster. ∎ Med. a dose of an immunizing agent increasing or renewing the effect of an earlier one. ∎ the first stage of a rocket or spacecraft, used to give initial acceleration. ∎ a device for increasing electrical voltage or signal strength.2. inf. a shoplifter.
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