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.
v (intransitive) To lament; to grieve.
v (intransitive) To utter sighs over; to lament or mourn over.
v (intransitive) To experience an emotion associated with sighing.
v (intransitive) To make a sound like sighing.
v (transitive) To exhale (the breath) in sighs.
v (transitive) To express by sighs; to utter in or with sighs.
v (transitive|archaic) To utter sighs over; to lament or mourn over. (rfex)
! An expression of fatigue, exhaustion, grief, sorrow, frustration, or the like, often used in casual written contexts.