hollow [ˈhɑːloʊ]

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¹ hollow adjective

• having nothing inside : not solid
• curved inward or down
• not having real value or meaning

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² hollow noun

• a place or area (especially on the ground) that is lower than the area around it
• an empty space inside of something

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³ hollow verb

• to remove the inside of (something) —often used as (be) hollowed