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English definition of “block sth out”

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block sth out

verb [T] uk phrasal verb with block   /blɒk/ us    /blɑːk/

(STOP FROM PASSING)

to stop light or noise from passing through something: The tree outside the window blocks out the sun.

(STOP FROM THINKING)

to stop yourself from thinking about an unpleasant memory because it upsets you: He's trying to block out memories of the accident.
(Definition of block sth out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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