sigh in WordNet English dictionary

1. an utterance made by exhaling audibly
   sigh  suspiration 
   
2. a sound like a person sighing
   "she heard the sigh of the wind in the trees"
   sigh 
   

1. heave or utter a sigh; breathe deeply and heavily
   "She sighed sadly"
   sigh  suspire 
   
2. utter with a sigh
   sigh