From Longman Dictionary of Contemporary Englishsidebarside‧bar /ˈsaɪdbɑː $ -bɑːr/ noun [countable]1a separate part of something such as a newspaper article where extra information is given2American English law an occasion when the lawyers and the judge in a trial discuss something without letting the jury hear what they are sayingExamples from the Corpussidebar• Longer boxed sections in magazines are sometimes referred to as sidebars.From Longman Business Dictionarysidebarside‧bar /ˈsaɪdbɑː-bɑːr/ noun [countable]COMPUTING a long narrow area containing written material at the side of the main material on a website