Definition of Christmas lights in US English:

Christmas lights

plural noun

  • 1Small white or differently colored electric lights spaced evenly along a cable and used for decoration, especially at Christmas.

    ‘untangling Christmas lights can ruin a great day of decorating’
    1. 1.1 A display of Christmas lights in a public place or outside a house or other building.
      ‘we asked readers to show us the best Christmas lights in the city’