What is the word or phrase for that action when someone smiles at something heartwarming and exhales air involuntarily at the same time? It's not a laugh or even a chuckle, more like a hum with no vocalization.


1 Answer 1


There are many synonyms for sigh but none seem to capture the appreciative nuance that you seek. In some contexts you may be able to use purr.

= (of a cat) to make a soft, low, continuous sound


= a low vibratory murmur typical of an apparently contented or pleased cat

Merriam Webster

The duration of the sound is not defined. Although having feline origins, the word has sometimes been extended to describe a soft appreciative sound:

I could almost hear Julie’s purr of appreciation at my “supplementary”: “As St Augustine reminded us: ‘Lord, make me pure, but just not yet’.”

Catholic Herald

It is just that he is never more vulnerable than when he has just provoked a purr of appreciation

Daily Mail

  • I notice that no attempt is made to render the sound using IPA. The CH example shows that the noise is possibly subliminal. But the word works. Commented Apr 12, 2021 at 13:04

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