A relaunch is a new push to sell something that is already out in the world — a drink with new packaging, an app that failed and comes back with a new look, a magazine that tries again with a new editor. Companies relaunch products; people also talk about relaunching a career or a campaign, stretching the word a little. It is business language, quite ordinary in news and marketing, not poetic. The verb is as common as the noun: they relaunched the phone in Asia. Though actually, a launch is the first sending-out; a relaunch admits the first try is already history. If nothing was ever launched, you cannot relaunch it.