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English definition of “tracer”

tracer

noun [C] uk   /ˈtreɪ.sər/ us    /-sɚ/
a bullet that leaves a line of flame or smoke behind it when it is fired, so that you can see the direction it has taken: Tracer bullets streaked through the sky. The sky was bright with tracer fire.
(Definition of tracer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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