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Aim for the moon
means to set your goals very high, even if achieving them seems difficult or unlikely. It’s all about striving for greatness and pushing yourself to do your best.

Examples:
1- A young athlete aimed for the moon by training to compete in the Olympics, knowing it would take years of hard work and dedication.
2- My little brother said he was going to aim for the moon and eat 20 slices of pizza in one sitting. He only made it to five, but his ambition was impressive