noun
a person who is very skilled or successful at something
verb
to move quickly with a humming or buzzing sound
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The young prodigy was a whiz at solving complex mathematical equations.
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My little sister is a whiz when it comes to using technology.
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That guy is a real whiz in the kitchen, he can cook anything!
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She's a whiz at multitasking, she can juggle multiple tasks effortlessly.