sigh

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Related to sighs: Bridge of Sighs

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 ?
All this time neither she nor they had removed their veils or spoken a word, only on sitting down on the chair the woman gave a deep sigh and let her arms fall like one that was ill and weak.
The heads were gone (knocked off by the French during their occupation of Venice,) but these were the throats, down which went the anonymous accusation, thrust in secretly at dead of night by an enemy, that doomed many an innocent man to walk the Bridge of Sighs and descend into the dungeon which none entered and hoped to see the sun again.
The only thing is to prepare ourselves for changes," said Sighs, who had conducted the fifth form for five and twenty years with unparalleled incompetence.
Yes," replied the old man, heaving the monosyllable from his chest with a hoarse, broken sigh.
The little voice sighed deeply: it was VERY unhappy, evidently, and Alice would have said something pitying to comfort it, 'If it would only sigh like other people
But I found I was wrong, for as soon as I loosened the knot around his neck, he gave a long sigh and mumbled with a faint voice, `Now I feel better
This unguarded expression made Montalais laugh and Raoul sigh with happiness, for he interpreted it thus: "She knows all our love.
said Rosa, with a sigh, "you are very fond of your bulbs.
Soon it had entirely disappeared in the gloom, and then Dorothy gave a sigh of regret at parting with Uncle Henry and began to wonder what was going to happen to her next.
Sigh indeed we sometimes may; but it is generally in the absence, not in the presence, of the beloved object.
If I did not myself sigh before them, and chatter with cold, and patiently LET myself be swathed in their pity!
she said with a heavy sigh, looking penitently at Dolly.