lighten up

Become or cause to become less serious or gloomy, and more cheerful. For example, Lighten up, Sam—it'll turn out all right. This slangy expression transfers reducing a physical weight to a change of mood or attitude.


Nearby words

  1. light-struck,
  2. light-year,
  3. lightboard,
  4. lightboat,
  5. lighten,
  6. lightening,
  7. lighter,
  8. lighter fluid,
  9. lighter than air,
  10. lighter-than-air

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.