sigh / sī/ • v. [intr.] emit a long, deep, audible breath expressing sadness, relief, tiredness, or a similar feeling: Harry sank into a chair and sighed with relief| [with direct speech] “I'm in a bit of a mess,” Elaine sighed. ∎ fig. (of the wind or something through which the wind blows) make a sound resembling this: a breeze made the treetops sigh. ∎ (sigh for) poetic/lit. feel a deep yearning for (someone or something lost, unattainable, or distant): he sighed for days gone by.• n. a long, deep, audible exhalation expressing sadness, relief, tiredness, or a similar feeling: she let out a long sigh of despair| fig. when the aircraft touched down I breathed a sigh of relief. ∎ fig. a gentle sound resembling this, esp. one made by the wind.