sigh
n. countablen. a long, deep breath that you let out slowly. You usually do this when you are tired, sad, or feel relieved.
n. an audible, prolonged expiration of breath, often expressing fatigue, frustration, or relief.
She let out a long sigh of relief after the exam.
The teacher gave a heavy sigh when he saw that half the class had forgotten their homework again.
A collective sigh rippled through the audience as the protagonist finally reunited with his family after years of separation.
From Middle English sighen (“to sigh”), back-formation from sighte, past tense form of siken, from Old English sīcan, from Proto-West Germanic sīkan, perhaps ultimately from Proto-Indo-European seykʷ- (“to pour out”).
From Middle English sighe (“sigh”), from sighen (“to sigh”) (see [[#Etymology 1]]).
Often used in the phrase 'a sigh of relief' or 'a sigh of frustration'.