eat (something or someone) for breakfast

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eat (something or someone) for breakfast

To defeat someone or succeed at something easily. Often used as part of a boast. He can challenge me all he wants, I'm not worried! I eat chumps like him for breakfast! If anyone can write a term paper in one night, it's Rich—he eats assignments like that for breakfast!
See also: breakfast, eat

will eat someone for breakfast

 and will have someone for breakfast
Fig. will defeat someone thoroughly. Watch out! Those guys are incredibly aggressive. They will eat you for breakfast.
See also: breakfast, eat, will