A sound you make to show doubt, confusion, or to ask for clarification about something.
An imitative word with origins in English phonetics, representing a natural vocalization that became standardized in written English. The exact origin is unclear, but it's been used since at least the 19th century as an onomatopoeia for skeptical or questioning sounds.
Different languages have their own skeptical grunts—English has 'hunh,' Spanish has 'eh,' and Japanese has 'huh?'—showing how even our doubts sound different depending on where we're from.
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