Scrabble Dictionary

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Yes, sinew is playable

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"Sinew" Definition

noun

A tendon.
The source or mainstay of vitality and strength. Often used in the plural: "Good company and good discourse are the very sinews of virtue” ( Izaak Walton).
Vigorous strength; muscular power.
One dressed for use as a cord or thread.
Solid resilient strength .

verb-transitive

To strengthen with or as if with sinews.

verb

To strengthen as if with .