/ saɪ; NAmE / verb , noun
■ verb
1.
[ v ] sigh (with sth) to take and then let out a long deep breath that can be heard, to show that you are disappointed, sad, tired, etc. :
He sighed deeply at the thought.
She sighed with relief that it was all over.
2.
[ v speech ] to say sth with a sigh :
'Oh well, better luck next time,' she sighed.
3.
[ v ] ( literary ) ( especially of the wind ) to make a long sound like a sigh
■ noun
an act or the sound of sighing :
to give / heave / let out a sigh
a deep sigh
'I'll wait,' he said with a sigh.
We all breathed a sigh of relief when it was over.
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WORD ORIGIN
Middle English (as a verb): probably a back-formation from sighte , past tense of siche , sike , from Old English sīcan .