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Nut
[NOUN]2
a flat piece of metal with a hole in the middle through which a bolt is put, used as a fastener
4
a small piece on the headstock of a guitar that supports the strings and maintains proper spacing and height between the strings and the fretboard
Examples
1. She is a hard nut
2. The squirrel was running with a small nut in its mouth.
3. The problem is a hard nut to crack.
4. The team's defense is a tough nut to crack.
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