v. & n.
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).
[ ME sihen etc., prob. back-form. f. sihte past of sihen f. OE sican ]