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sigh (v.)

mid-13c., probably a Middle English back-formation from sighte, past tense of Old English sican "to sigh," perhaps echoic of the sound of sighing. Related: Sighed; sighing.

sigh (n.)

early 14c., from sigh (v.).

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Definitions of sigh from WordNet
1
sigh (v.)
heave or utter a sigh; breathe deeply and heavily;
She sighed sadly
Synonyms: suspire
sigh (v.)
utter with a sigh;
2
sigh (n.)
an utterance made by exhaling audibly;
Synonyms: suspiration
sigh (n.)
a sound like a person sighing;
she heard the sigh of the wind in the trees
From wordnet.princeton.edu