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- Dictionarypacemaker/ˈpeɪsˌmeɪkə/
noun
- 1. a person or animal who sets the pace at the beginning of a race, sometimes in order to help a runner break a record: "he acted as a pacemaker for Bannister when he broke the four-minute mile"
- 2. a device for stimulating the heart muscle and regulating its contractions.
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