From Longman Dictionary of Contemporary Englishswingometerswing‧om‧e‧ter /swɪŋˈɒmɪtə $ -ˈɑːmɪtər/ noun [countable] British English informalAMTPPG a piece of equipment used in television programmes to show how many votes each political party is getting during an election
Examples from the Corpus
swingometer• But in such a setting Peter Snow's neon swingometer was, frankly, a disappointment.• A Radio Times election supplement shows the new swingometer. 