To have the ability to endure, stay relevant, or continue to maintain interest. Said of a concept, phenomenon, something discussed, etc. That theory really has legs—years later, most people still think that the wrong man was convicted.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
If an idea, plan, or story has legs, it is likely to be successful or to continue. Blucher was confident that his concept had legs, so he pressed Cooper for a meeting. In this instance the story might not have legs.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
have ˈlegs(informal) if a news story, film/movie, etc. has legs, people will continue to be interested in it, or it will be successful, popular, etc. for a long time: We’ll soon see if the movie has legs. ♢ Some economists believe that the recovery still has legs.
Farlex Partner Idioms Dictionary © Farlex 2017