Giving dad a run for his money 是什麼意思

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giving him a good challenge

You make sure to give him a run for his money!
You make sure to give give him a good challenge!
You make sure to push him to his limits!

Imagine you and someone else are about to race. Your friend might say, "Make sure you give him a run for his money". (Don't make it easy on him. Make sure you give him a challenge. )

So, "Giving dad a run for his money", means pushing your dad to his limits, challenging him, and not making it easy on him... whether it's in a physically competitive activity, or something more academic.