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English definition of “hollow sth out”

hollow sth out

verb uk phrasal verb with hollow   /ˈhɒl.əʊ/ us    /ˈhɑː.loʊ/
to make an empty space inside something: Sand carried by the wind has hollowed out the base of the cliff.
(Definition of hollow sth out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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