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Definition of Johnny-one-note
1. Noun. (idiomatic chiefly US Canada) A person (or organization) who often expresses a strong opinion or viewpoint on a single subject or a few particular subjects. ¹
2. Noun. (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. ¹
¹ Source: wiktionary.com