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Closed book
/kloʊzd
bʊk/
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Closed book
noun
1.
Something that baffles understanding and cannot be explained.
Synonyms:
enigma
,
mystery
,
secret
.
"It remains one of nature's secrets"
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Etymology of 'Closed book'
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Words linked to "Closed book" :
secret
,
mystery
,
enigma
,
perplexity
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