He muffed a good opportunity for a promotion.
She had a wonderful opportunity, but she muffed it.
He muffed a good opportunity for a big contract.
The Palestinians have hardly been faultless. Mahmoud Abbas, their leader, has often dithered. He muffed a half-chance for a deal with Mr Netanyahu's predecessor, Ehud Olmert, three years ago.
I had a chance to impress her with my efficiency and I muffed it up.
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