Meaning of “hollow” in the English Dictionary

"hollow" in British English

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hollowadjective

uk /ˈhɒl.əʊ/ us /ˈhɑː.loʊ/

hollow adjective (EMPTY)

C2 having a hole or empty space inside:

a hollow tube
Hollow blocks are used because they are lighter.
a hollow log
hollow cheeks/eyes

If you have hollow cheeks or eyes, your cheeks curve in or your eyes look deep in your head because you are old, tired, or ill.

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hollowness
noun [ U ] uk /ˈhɒl.əʊ.nəs/ us /ˈhɑː.loʊ.nəs/

the hollowness of fame/success

hollownoun [ C ]

uk /ˈhɒl.əʊ/ us /ˈhɑː.loʊ/

a hole or empty space in something, or a low area in a surface:

The dog found a hollow in the ground to hide in from the wind.

US a valley:

We used to go for long walks in the hollow.
Sleepy Hollow

(Definition of “hollow” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"hollow" in American English

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hollowadjective

us /ˈhɑl·oʊ/

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).

hollownoun [ C ]

us /ˈhɑl·oʊ/

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)