Sentence:  To Pollyanna the air was all the more stifling after that cool breath of the out of doors; but she did not complain. She only drew a long quivering <WSD>sigh</WSD>. 
Meaning of the word marked with <WSD> tags:  A deep, prolonged audible inhale and exhale of breath; as when fatigued, frustrated, grieved, or relieved; the act of sighing.