Johnny-one-note meaning

(idiomatic, chiefly US, Canada) A person (organization) who often expresses a strong opinion or viewpoint on a single subject or a few particular subjects.
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(idiomatic, chiefly US, Canada) An opinion or viewpoint on a single subject or a few particular subjects which is frequently expressed by a person or organization.
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Origin of johnny-one-note

  • "Johnny One Note" is a show tune from the 1937 Rodgers and Hart musical Babes in Arms. The lyrics tell a story of a male vocalist named Johnny who sang with a band and could sing only one note, but sang that note extremely well.

    From Wiktionary