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English definition of “sidebar”

sidebar

noun [C]   /ˈsaɪd.bɑːr/ US  /-bɑːr/
a box or narrow area on a newspaper or magazine page that contains a short news story or extra information relating to a longer main storyHeadlines and features in newspapers and magazines a narrow area at the side of a page on a website, giving extra information or links
(Definition of sidebar noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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