Dictionary

lighten up

verb

Definition of LIGHTEN UP

intransitive verb
:  to take things less seriously
ADVERTISEMENT

First Known Use of LIGHTEN UP

1911

Browse

Next Word in the Dictionary: light equationPrevious Word in the Dictionary: lightening holeAll Words Near: lighten up
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears