false note
podstatné jméno
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(music) An incorrect note which is sung or played in a musical performance.
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(idiomatic, by extension) In a remark or narrative, an indication (as discerned by the listener or reader) of untruth, insincerity, or inconsistency.
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(idiomatic, by extension) In a non-verbal display or presentation, an indication of incongruity or inappropriateness.