on one's guard

idiom

Definition of on one's guard

: watching for possible danger, threats, problems, etc. inspectors on their guard for certain violations that are often overlooked

Learn More About on one's guard

Dictionary Entries Near on one's guard

on one's game

on one's guard

on one's hands and knees

See More Nearby Entries 

Statistics for on one's guard

Cite this Entry

“On one's guard.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20guard. Accessed 18 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!