Enter a clue or pattern or both:
The Clue
Makes a string flat, maybe (7 letter answer)
The Answer
UNTUNES
Tags
Notes
The answer UNTUNES is so rare that it appears less than once every 2500 puzzles.
Definition
UNTUNE as a verb:
1. (upset, discompose, untune, disconcert, discomfit) = cause to lose one's composure
2. cause to be out of tune; "Don't untune that string!"