an act or the sound of sighing to give/heave/let out a sigh a deep sigh ‘I'll wait,’ he said with a sigh. We all breathed a sigh of relief when it was over. Word Origin Middle English (as a verb): probably a back-formation from sighte, past tense of siche, sike, from Old English sīcan.Extra examples A heavy sigh came from her mother. A weary sigh escaped him. His departure prompted a few wistful sighs and the odd tear from admirers. I breathed a sigh of relief. Nancy heaved an inward sigh but did as her son suggested. She gave a deep sigh of contentment. She let out her breath on a sigh. The crowd breathed a collective sigh of relief. There was an audible sigh of relief when the news came through that nobody was hurt. ‘I’ll wait,’ he said with a sigh. Suppressing a sigh, she settled back to work. We all breathed/heaved a great sigh of relief when it was over.