no obj.
1- emit a long, deep, audible breath expressing sadness, relief, tiredness, or similar叹气, 叹息：
Harry sank into a chair and sighed with relief.
哈里倒在椅子上, 宽慰地松了一口气。
1.1
- figurative (of the wind or something through which the wind blows) make a sound resembling this〈喻〉（风, 风吹过的东西）呼啸, 悲鸣：
a breeze made the treetops sigh.
树顶在微风中瑟瑟悲鸣。
1.2
sigh for
poetic/literary feel a deep yearning for (someone or something lost, unattainable, or distant)〈诗/文〉渴望, 思慕：he sighed for days gone by.
他怀念往昔。
1
- a long, deep, audible exhalation expressing sadness, relief, tiredness, or similar叹气, 叹息; 叹息声：
she let out a long sigh of despair
她失望地长叹了一口气
figurative 〈喻〉the councils heaved a sigh of relief when they saved over £6 m between them.
当委员会之间节省了600多万英镑的开支时, 他们宽慰地舒了一口气。
1.1
- figurative a gentle sound resembling this, especially one made by the wind〈喻〉（尤指风发出的）叹息般的声音。
词源
Middle English (as a verb)： probably a back-formation from sighte, past tense of siche， sike, from Old English sǐcan.