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==Origin==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] (as a verb): probably a back-formation from ''sighte'', past tense of ''siche'', ''sike'', from [http://nordan.daynal.org/wiki/index.php?title=English#ca._600-1100.09THE_OLD_ENGLISH.2C_OR_ANGLO-SAXON_PERIOD Old English] sīcan.
*[http://en.wikipedia.org/wiki/13th_century 13th Century]
==Definitions==
*1: emit a long, deep, audible [[breath]] expressing sadness, relief, tiredness, or a similar [[feeling]]: Harry sank into a chair and sighed with relief | [ with direct [[speech]] ] : “I'm in a bit of a mess,” Elaine sighed.
*2: (of the [[wind]] or something through which the wind blows) make a [[sound]] resembling this: a breeze made the treetops sigh.
*3: (sigh for) literary [[feel]] a deep yearning for (someone or something lost, unattainable, or distant): he sighed for days gone by.
==Description==
A '''sigh''' is a kind of paralinguistic [[respiration]] in the form of a deep and especially audible, single exhalation of air out of the mouth or nose, that humans use to [[communicate]] [[emotion]]. It is voiced [https://en.wikipedia.org/wiki/Pharyngeal_fricative pharyngeal fricative], sometimes associated with a guttural glottal breath exuded in a low [[tone]]. It often arises from a negative emotion, such as dismay, dissatisfaction, [[boredom]], or futility. A sigh can also arise from positive emotions such as relief, particularly in response to some [[negative]] situation ending or being avoided. Like a gasp, a yawn, or a moan, a sigh is often an [[automatic]] and unintentional act. In [[literature]], a sigh is often used to signify that the person producing it is lovelorn.
Andy Murray letting out a sigh during a game.

Scientific studies show that [[babies]] sigh after 50 to 100 [[breaths]]. This serves to improve the mechanical properties of lung tissue, and it also helps babies to develop a regular breathing [[rhythm]]. [[Behaviors]] equivalent to sighing have also been observed in [[animals]] such as dogs, monkeys, and horses.

In text messages and internet chat rooms, or in comic books, a sigh is usually [[represented]] with the [[word]] itself, 'sigh', possibly within asterisks, *sigh*.[https://en.wikipedia.org/wiki/Paralanguage#Sighs]

[[Category: Languages and Literature]]