Having a strong, vigorous, or effective quality; in audio, having prominent bass or impact.
From punch + -y suffix, originally meaning 'having the quality of a punch'. The word developed metaphorical senses in the 20th century, particularly in music and writing contexts.
In audio engineering, 'punchy' describes that satisfying thump you feel in your chest during a great bass line. It's one of those wonderfully onomatopoetic words where the sound perfectly matches the meaning - short, sharp, and impactful.
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