To discover or expose as fake, insincere, or inaccurate.(verb)
To put a batsman out by catching the batted ball before it touches the ground.(verb)
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Use "catch out" in a sentence
"Dad, how’re you doing?” she asked and tried to keep the catch out of her throat."
"It went slowly and precisely, Nerva being Nerva — he did, by the way, evolve an excellent system to catch out slaves claiming to be Italian who were not Italian, by quizzing them in Oscan and local geography of our peninsula."