tuning peg
US /ˈtuːnɪŋ peɡ/
UK /ˈtuːnɪŋ peɡ/
1.
a device on a stringed musical instrument that is turned to adjust the tension of a string and thereby change its pitch
:
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He carefully adjusted each tuning peg on his guitar to get the perfect pitch.
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One of the tuning pegs on my violin is loose, making it hard to keep in tune.