A slogan is a short phrase that is easy to remember. Companies put slogans on adverts. Politicians and groups shout them on signs and in speeches. The point is not to explain an idea fully — it is to stick in your head. Some slogans are clever and true enough; some are so simple they hide the hard parts of a question. The word has a rather grand past: it comes from Scottish Gaelic sluagh-ghairm, a battle cry — sluagh 'army, crowd' + gairm 'a call, a cry.' So a slogan began as a shout to gather fighters, and only later became the catchy line on a poster. In everyday English it is a fairly neutral word; when people dislike the empty use of such phrases, they reach for sloganeering instead.