sigh noun

ADJ. big, deep, great, heavy, huge | little, small, soft | long | heartfelt | resigned, weary | exaggerated | audible There was an audible sigh of relief when the news came through that nobody was hurt. | collective

VERB + SIGH breathe, give, heave, let out I breathed a sigh of relief. | repress, stifle, suppress | hear

SIGH + VERB escape sb A weary sigh escaped him.

PREP. on a ~ She let out her breath on a sigh. | with a ~ ‘I suppose we'd better get back to work,’ he said with a heavy sigh. | ~ of She gave a deep sigh of contentment.

PHRASES a sigh of relief > Note at SOUND