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1. A tendon.
2. Vigorous strength; muscular power.
3. often sinews The source or mainstay of vitality and strength: "Good company and good discourse are the very sinews of virtue" (Izaak Walton).
tr.v. sin·ewed, sin·ew·ing, sin·ews
To strengthen with or as if with sinews.
[Middle English sinewe, from Old English sinewe, oblique form of seonu, sinu.]
(Anatomy) having sinews