copystrike noun 1verb 1forms 5 noun1 •(Internet) A formal notice to a user on a website (particularly YouTube or other video-sharing site) reprimanding the user for copyright infringement.I uploaded a copy of the film trailer to the site, but the distributor removed it and gave me a copystrike. verb1 •(Internet) To issue a copystrike to someone or against a piece of content.I uploaded a copy of the film trailer to the site, but the distributor removed it and copystriked me. formscopystriked · copystruck · copystricken · copystriking · copystrikes