To knit together or make strong with, or as if with, sinews.
That which gives strength or in which strength consists; a supporting factor or member; mainstay.
A cord or tendon of the body.
A cord or string, particularly (music) as of a musical instrument.
Muscular power, muscle; nerve, nervous energy; vigor, vigorous strength.
To cause to give a higher tone or sound; to give a higher tone to; to make more intense; to heighten; to strengthen.
To firm and strengthen the muscles of the body by regular exercise.