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In page Voicelessness:

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Sonorants are sounds such as vowels and nasals that are voiced in most of the world's languages. However, in some languages sonorants may be voiceless, usually allophonically. For example, the Japanese word sukiyaki is pronounced [sɯ̥kijaki] and may sound like [skijaki] to an English speaker, but the lips can be seen to compress for the [ɯ̥].[citation needed] Something similar happens in English words like peculiar [pʰə̥ˈkj̊uːliɚ] and potato [pʰə̥ˈtʰeɪ̯ɾoʊ̯].