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Adjective: button-down  bú-t(u)n dawn
  1. Unimaginatively conventional
    - buttoned-down [US, informal], conservative
  2. Of a shirt; having the ends of the collar fastened down by buttons
    "Brooks Brothers button-down shirts"

See also: buttoned, conventional, fastened, mainstream, staid, stodgy, stuffy

Encyclopedia: Button-down