In the instrument world "sinker" means logs that sank before making it to the saw mill - so it's salvaged logs rather than salvaged lumber. I've played a few sinker wood guitars, but few could be compared to otherwise similar guitars with traditionally harvested wood.

1) quarter sawn: scié en quartier
la définition de quarter-sawn est :
mode de coupe du bois pour la fabrication des guitares.
comme l'image ci-dessous le tronc est scié en quartier.

https://www.guitareelectrique.com/di_quartier_sawn.html

2) sinker mahogany: en acajou "immergé"
https://www.guitarpart.fr/guitare-du-mois-martin-custom-shop...




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Note added at 2 jours 5 heures (2021-02-05 16:20:26 GMT) Post-grading
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merci