Definitions from Wiktionary ( )

▸ verb:  (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.
▸ verb:  (intransitive) To lament; to grieve.
▸ verb:  (transitive) To utter sighs over; to lament or mourn over.
▸ verb:  (intransitive) To make a sound like sighing.
▸ verb:  (transitive) To exhale (the breath) in sighs.
▸ verb:  (transitive) To express by sighs; to utter in or with sighs.
▸ noun:  A deep, prolonged audible inhale and exhale of breath; as when fatigued, frustrated, grieved, or relieved; the act of sighing.
▸ noun:  (figurative) a manifestation of grief; a lament.
▸ noun:  (Cockney rhyming slang) A person who is bored.

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