IdiomDaily LifeEnglish

catch someone off guard

Meaning: To surprise someone who is not prepared.

Example: “The question about his salary caught him off guard.”

Origin: From fencing and boxing, where "guard" is the defensive position. The phrase is common from the 19th century.

More English idioms

Explore another collection: Tongue Twisters

Tricky phrases to practice out loud, from languages around the world.

  • Unique New York. Three words that jam the 'y/n/k' sequence together — repeat it and it collapses into 'you…
  • Pad kid poured curd pulled cod. Alternating repetition — the consonants swap at the start of every other word, which is w…
  • Red lorry, yellow lorry. The 'l/r' alternation drill — deceptively short, yet almost impossible to say fast withou…

Browse all tongue twisters →

Keep exploring

Explore all idioms →