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slack-key

[slak-kee]
noun Also slack key.
  1. a style of Hawaiian popular music played on an acoustic guitar with strings tuned to notes lower than standard guitar tuning for more bass resonance.
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adjective
  1. noting or pertaining to this style of music.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018