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English definition of “hollow”

hollow

adjective  /ˈhɑl·oʊ/ us  

hollow adjective (EMPTY)

having an empty space inside or on the surface of an object: a hollow tree His hollow cheeks and paleness made him look ill. If a sound is hollow, it sounds as if it were made by hitting an empty container: the low, hollow rumble of thunder

hollow adjective (WITHOUT VALUE)

(of situations, feelings, or words) lacking value; not true or sincere: a hollow victory hollow promises Their objections had a hollow ring (= did not seem sincere).

hollow

noun [C]  /ˈhɑl·oʊ/ us  

hollow noun [C] (EMPTY)

an empty space inside something; a hole A hollow is also a small valley: We hiked along Bear Hollow last weekend.
(Definition of hollow from the Cambridge Academic Content Dictionary © Cambridge University Press)
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