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Unch - Unchecked Letter

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Definition: Unch, short for unchecked letter, refers to a square in a crossword puzzle which contains a letter from an Across answer but not a Down answer (or vice versa). This means the solver cannot check the veracity of the letter by solving the Across or Down clue. An unchecked letter is common in British-style crosswords but is not allowed in standard North American puzzles.
Also Known As: Unchecked letter, unchecked square
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