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By the width of a strand of hair, which is basically the difference between being awesome and getting roasted by your mom.
I barely won the race, just by a hair's breadth. My mom said I was lucky I didn't trip over my own ego.
He missed the bus by a hair's breadth. Now he's stuck walking to school in the rain.
She got the last slice of pizza by a hair's breadth. I'm still bitter about it.