sigh

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sigh

 [si]
1. a long, audible exhalation.
2. an intermittent inflation of the lungs with a large volume from a mechanical ventilator; this is essentially a deep breath that is incorporated into the ventilation cycle. The use of large tidal volumes has replaced the use of the sigh in many settings.

sigh

(),
1. An audible inspiration and expiration under the influence of some emotion.
2. To perform such an act.
[A.S. sīcan]

sigh

sigh

Respiratory medicine
A breath occurring at regular (predictable) intervals, possibly in response to a slow decrease in lung compliance, which is seen when constant ventilation is maintained; sighs tend to be followed by smaller than normal breaths.
 
Vox populi
A deep exhalation of breath, typically with an overtone of sadness or wistfulness.

sigh

Augmented breath Pulmonology A breath occurring at regular–predictable intervals, possibly in response to the slow ↓ in lung compliance seen when constant ventilation is maintained; sighs tend to be followed by smaller than normal breaths. Cf Noisy breathing.

sigh

()
1. An audible inspiration and expiration under the influence of some emotion.
2. To perform such an act.
[A.S. sīcan]

sigh (sī),

n an audible and prolonged inspiration followed by a shortened expiration.

sigh

complementary breathing cycles characterized by a quick, deep inspiration followed by a slower expiration; probably a compensatory mechanism to counter poor ventilation.
References in classic literature ?
So he did, so he did,' said the Gryphon, sighing in his turn; and both creatures hid their faces in their paws.
I am sighing more since it has been two-and-a-half years.
PUBLIC Health Warning: The following announcement may result in the need to put your forehead on a hard surface while sighing with incredulity.
Scientists have found that sighing resets breathing patterns that are getting out of whack and keep our respiratory system flexible.
AUTUMNAL MAGIC The autumn wind is sighing, As she whispers low your name, Sweet autumn you have come at last, To set the world ablaze.
The scientists, from the Catholic University in Rome, said they are more likely to be exposed to second-hand smoking but said the increased risk may also be due to a lack of SIGHING.
Problem is, you feel like crying instead of sighing.