coffin corner

any of the corners of a football field formed by a goal line and side line: punts are sometimes directed to a coffin corner so that the ball will go out of bounds near the opponent's goal line

Origin: radio slang, prob. with reference to the grave of the defending team's hopes

See coffin corner in American Heritage Dictionary 4

noun
Football
Either corner of the field formed by the sideline and the defending team's goal line. The ball may be deliberately punted out of bounds in this area, thus forcing the receiving team to play very close to its goal line.
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