Definition of Day-Glo in English:

Day-Glo

(also dayglo)

noun

mass nountrademark
  • A fluorescent paint or other colouring.

    • ‘This figure, too, is rendered in black silhouette on Day-Glo.’
    • ‘This kit includes a heavy-gauge lunchbox, six colors of Day-Glo paint that glow in black light, a brush, plastic stencils and an illustrated tips and facts guide.’
    • ‘We had to go back and cut out the Day-Glo, then reapply it in the places where it worked.’
    • ‘Fluorescent materials (like Day-Glo paint) only glow when excited by the ultraviolet light.’

adjective

  • Very bright or fluorescent in colour.

    ‘their clothing was marked with Day-Glo panels’
    • ‘Where a patch of blue sky is not blue enough, Hutchinson fills it in with a Day-Glo yellow marker.’
    • ‘The Day-Glo cap he's loaned me is too big.’
    • ‘The Breeze-Man, decked out in some kind of bright orange Day-Glo sweatsuit, tells her to keep a good lookout.’
    • ‘Thousands of police officers in Day-Glo jackets filled the city center.’
    • ‘Have you still got that Day-Glo green Lycra dress?’
    • ‘The walls have all been painted brown, I notice, and the bedroom doors are coloured an acutely mind-expanding Day-Glo orange.’

Origin

1950s: blend of day and glow.

Pronunciation

Day-Glo

/ˈdeɪɡləʊ/