Meaning of “hollow” in the English Dictionary

"hollow" in British English

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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.

More examples

hollow adjective (NOT SINCERE)

C2 (of situations, feelings, or words) without value, or not true or sincere:

It was something of a hollow victory - she won the case but lost all her savings in legal fees.
Even sex had become a hollow pleasure.
Will their good intentions become realities or are they just hollow promises?
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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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)