—v.
1 intr. emit a long deep audible breath expressive of sadness, weariness, longing, relief, etc.
2 intr. (foll. by for) yearn for (a lost person or thing).
3 tr. utter or express with sighs ('Never!' he sighed).
4 intr. (of the wind etc.) make a sound like sighing.
—n.
1 the act or an instance of sighing.
2 a sound made in sighing (a sigh of relief).
Etymology: ME sihen etc., prob. back-form. f. sihte past of sihen f. OE sican
Useful english dictionary. 2012.