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Hollow

usgb/ˈhɑːləʊ/Volume
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Physical emptiness

Use 'hollow' to describe objects that are empty on the inside, like tubes or boxes.

Illustration for Physical emptiness
She tapped the wall, looking for the hollow parts.
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Sound quality

'Hollow' can also describe a sound that echoes, as if coming from an empty space.

Illustration for Sound quality
The room's acoustics made her voice sound hollow.
Visual representation of the word "Hollow"

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