tagline noun 6verb 1forms 3 noun6 •An advertising slogan. •A pithy quotation habitually appended to a signature in email, newsgroups, etc. •The punch line of a joke. •A line attached to a draft of cargo or a container to provide control and minimize pendulation of cargo during lifting operations. •A light rope attached to an object being hoisted by a crane, used to guide it while lifting or lowering. •(old-fashioned) Synonym of subheadline. verb1 •To supply with an advertising slogan; to market as. formstaglined · taglining · taglines