"Say less" is an informal expression that is the slang equivalent of "say no more," which means the speaker understands or agrees with what has been said and that no further explanation or information is necessary. The saying is often used in response to a statement, request, or suggestion when the context or message is clear and there is no need for additional words or details.

Both "say less" and "say no more" can be used to express agreement, acknowledgment, or compliance with someone's request or idea. They are ways of indicating that the listener is on the same page and does not require further convincing or elaboration. For example, suppose Person A suggests, "Let's order pizza for dinner tonight." Then, Person B may respond with "Say no more! Pizza sounds great" or "Say less! Pizza sounds great," which shows that Person B is expressing their agreement and support for the proposed idea.

"Say no more" is the original and older expression, while "say less" is its younger and more casual cousin. Although both are casual sayings and only used colloquially, "say less" is considered even more informal and typically limited to use among friends and on social media.

Below are example sentences of both "say less" and "say no more."

Example sentences

  1. You're tired today? Say no more, I'll take care of the dishes tonight.
  2. Say less! Your point is crystal clear.
  3. Say no more; I'll pick up the kids from school.
  4. Say less and let's get to work on this project.
  5. You forgot your wallet? Say no more; I'll cover the bill for dinner.
  6. Say less about your plans; surprise me.
  7. Say no more. I understand your perspective.
  8. Say less about the details; we trust your judgment.
  9. Say no more. I'll make sure the presentation is ready.
  10. Say less and enjoy the peacefulness of the moment.

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Reference:

What does Say Less mean? | Later Social Media Glossary
Learn what say less means, how to use it, and how you can use this Gen-Z slang on social media here.
Definition of SAY NO MORE
—used to tell someone that it is not necessary to explain something further because one understands what that person is trying to say… See the full definition