THE IDIOM COLLECTION LEARN & PRACTISE
Catch someone red-handed
Understand the meaning. See it in context. Make it yours.
01 / UNDERSTAND
Meaning in plain English
To discover someone while they are actually doing something illegal.
02 / SEE IT IN CONTEXT
The expression in a sentence
- In the mystery story, the guard caught the thief red-handed as he removed a painting.
03 / CHECK YOUR UNDERSTANDING
Quick idiom quiz
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Can you recall the expression?
Which expression from this lesson matches this meaning?
To discover someone while they are actually doing something illegal.
Show the answer
Catch someone red-handed — To discover someone while they are actually doing something illegal.
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Make it yours
Write one sentence using “Catch someone red-handed” about your own life.
Check your sentence
Does your sentence match this meaning?
To discover someone while they are actually doing something illegal.
Compare: In the mystery story, the guard caught the thief red-handed as he removed a painting.
Check the spelling and how the expression fits the sentence. Your example can be different.
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More ways to understand and use it
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When to use it
Use it when the person is found in the act, rather than merely suspected later. It suits conversation and reports; use care with real accusations.
More examples in context
- The detective hoped to catch the burglar red-handed inside the warehouse.
- The shop’s security officer caught a thief red-handed taking money from the till.
Usage note
Use caught for the past tense and keep the hyphen in red-handed. The expression emphasises discovery during the act, not evidence found long afterwards.
A short conversation
A: How did the detective know who had stolen the jewellery?
B: She caught the thief red-handed taking a necklace from the display case.
A: That explains the ending of the story.
One more practice question
Which fictional thief is caught red-handed?
A. A thief discovered while actively taking the stolen goods.
B. A suspect questioned months later with no observation of the theft.
Check your answer
A. The person is discovered in the act itself.
Related lessons
Meaning and usage checked against Cambridge Dictionary. Explanations, examples and conversation are original.