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Like an exposed shirttail, 8 letters
Not securely in bed, maybe, 8 letters
Pulls back, as a sheet, 7 letters
Deliberately disharmonize, 6 letters
Negatively affect the pitch of, 6 letters
Put out of condition, as a piano, 6 letters
Render out of pitch, 6 letters
In need of adjustment, 7 letters
Like an off-pitch piano, 7 letters
Out of key, as a piano, 7 letters
Knocks out of pitch, 7 letters
Makes a string flat, maybe, 7 letters
Like the pages of a brand new book, 8 letters
In need of instruction, 9 letters