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The phrase "catch out" is correct and can be used in written English.
It can be used to mean to discover that someone is not telling the truth or is doing something wrong, usually through a test or difficult question. For example: "The teacher caught out the student for not doing the assigned reading."
Dictionary
catch out
verb
To discover or expose as fake, insincere, or inaccurate.
synonyms
Exact(53)
"Amani was playing catch out there," Fassel said.
"They have changed the system to catch out more people.
That would catch out the computer, how could it read it out loud.
Unfortunately for Palace Yannick Bolasie's element of surprise did not often catch out his opponents.
It can catch out European horses – our stayers can get lost.
LIKE many technologies, the mobile phone makes possible new kinds of deception and new ways to catch out the dishonest.
Similar(6)
That would not catch out-of-London gains, but nothing's perfect.
To catch out-of-reach prey, the Komodo dragon may stand on its hind legs and use its tail as a support.
The best of our trials (60% power to detect a 5% fall in prawn catch) out-performed similar-sized trials.
The old-timers knew the schedules, yard layouts, and catch-out spots by heart through years of repetition and experience.
The next morning, feeling like our catch-out spot might be a dud, we ventured into the main train yard.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com