Sigh - (Webster's 1828 Dictionary)
SIGH, v.i. To inhale a larger quantity of air than usual and immediately expel it; to suffer a single deep respiration. He sighed deeply in his spirit. Mark 8.
1. To lament; to mourn. Ages to come and men unborn Shall bless her name and sigh her fate.
2. To express by sighs. The gentle swain-sighs back her grief.
SIGH, n. A single deep respiration; a long breath; the inhaling of larger quantity of air than usual, and the sudden emission of it. This is an effort of nature to dilate the lungs and give vigor to the circulation of the blood, when the action of the heart and arteries is languid from grief, depression of spirits, weakness or want of exercise. Hence sighs are indications of grief of debility.