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challenge (verb)
To question the validity, truth, or authority of something, or to invite someone to take part in a competition or a demanding task. It often involves testing someone's abilities or demanding proof for a statement.
"I challenged my brother to a race to the end of the street."
Think of a 'CHALice' (a cup) at the end of a 'CHALlenge'. You have to work hard and question the rules to win the golden...
I challenge for you. → I challenge you.
He challenged me with a game of chess. → He challenged me to a game of chess.
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