·noun Muscle; nerve.
II. Sinew ·noun Fig.: That which supplies strength or power.
III. Sinew ·vt To knit together, or make strong with, or as with, sinews.
IV. Sinew ·noun A tendon or tendonous tissue. ·see Tendon.
·adj Having the sinews under the belly shrunk by excessive fatigue. ...
Webster's Dictionary of the English Language