sigh

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To exhale audibly in a long deep breath, as in weariness or relief.
• intransitive verb To emit a similar sound.
• intransitive verb To feel longing or grief; yearn.
• intransitive verb To express with or as if with an audible exhalation.
• intransitive verb Archaic To lament.
• noun The act or sound of sighing.

from The Century Dictionary.

• To heave or draw a sigh (see sigh, n.); make an audible inspiration and expiration indicative of some emotion; make an expressive respiratory sound: as, to sigh with grief or disappointment, or (less commonly) from satisfaction or the sense of relief.
• Hence To experience an oppressive mental sensation; yearn or long, as from a special access of emotion or desire: often with for: as, to sigh for the good old times.
• To make a sound resembling or suggestive of a sigh; sound with gentle or subdued mournfulness: said of things, especially the wind and its effects.
• To emit, use, or act upon or in regard to with sighs or in sighing; utter, express, lament, etc., with sighing utterance or feeling: used poetically with much latitude: as, to sigh out one's love, pleasure, or grief.
• See sie.
• A Middle English preterit of see.
• noun A sudden involuntary deep-drawn inspiration of breath, followed by its more or less audible expiration, usually expressive of some emotion or sensation: as, a sigh of grief, chagrin, relief, pleasure, or fatigue.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb 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, or the like.
• intransitive verb Hence, to lament; to grieve.
• intransitive verb To make a sound like sighing.
• transitive verb To exhale (the breath) in sighs.
• transitive verb To utter sighs over; to lament or mourn over.
• transitive verb To express by sighs; to utter in or with sighs.
• noun A deep and prolonged audible inspiration or respiration of air, as when fatigued or grieved; the act of sighing.
• noun Figuratively, a manifestation of grief; a lan�ent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A deep and prolonged audible inspiration or respiration of air, as when fatigued, frustrated, grieved, or relieved; the act of sighing.
• noun Figuratively, a manifestation of grief; a lament.
• noun Cockney rhyming slang A person who is bored.
• 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 intransitive To utter sighs over; to lament or mourn over.
• verb intransitive To experience an emotion associated with sighing.
• 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.
• verb transitive, archaic To utter sighs over; to lament or mourn over.
• interjection An expression of fatigue, exhaustion, grief, sorrow, frustration, or the like, often used in casual written contexts.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb heave or utter a sigh; breathe deeply and heavily
• verb utter with a sigh
• noun a sound like a person sighing
• noun an utterance made by exhaling audibly