Definition of sighs:
(v) :
(intransitive) To inhale a larger quantity of air than usual, and immediately expel it; to make a deep single audible respiration, especially as the result or involuntary expression of fatigue, exhaustion, grief, sorrow, frustration, or the like.
(n) :
A deep, prolonged audible inhale and exhale of breath; as when fatigued, frustrated, grieved, or relieved; the act of sighing.
(v) :
(transitive) To exhale (the breath) in sighs.
(v) :
(transitive) To express by sighs; to utter in or with sighs.
(v) :
(intransitive) To lament; to grieve.
(v) :
(transitive) To utter sighs over; to lament or mourn over.