Meaning of “underneath” in the English Dictionary

"underneath" in British English

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underneathpreposition, adverb

uk /ˌʌn.dəˈniːθ/ us /ˌʌn.dɚˈniːθ/

B1 under or below:

The tunnel goes right underneath the city.
They found a bomb underneath the car.
Underneath that shy exterior, she's actually a very warm person.
He was wearing a garish T-shirt underneath his shirt.

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underneathnoun

uk /ˌʌn.dəˈniːθ/ us /ˌʌn.dɚˈniːθ/

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

"underneath" in American English

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underneathadjective, adverb [ not gradable ]

us /ˌʌn·dərˈniθ/

directly under and usually hidden by something else:

The Lincoln Tunnel passes underneath the Hudson River, which separates New York from New Jersey.
When the painting was restored, an older painting was discovered underneath.

(Definition of “underneath” from the Cambridge Academic Content Dictionary © Cambridge University Press)