hollow
adjective
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devoid of significance or pointvacuous
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as if echoing in a hollow space“the hollow sound of footsteps in the empty ballroom”
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not solid
noun
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a depression hollowed out of solid matterhole
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a small valley between mountains“I built myself a cabin in a hollow high up in the Appalachians.”holler
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a cavity or space in something“hunger had caused the hollows in their cheeks”
verb
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remove the interior of“hollow out a tree trunk”hollow outcore out
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remove the inner part or the core ofdig