Meaning of “(as) clear as day” in the English Dictionary

british dictionary

"(as) clear as day" in British English

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(as) clear as day

very easy to understand:

The instructions were as clear as day.

certain:

It's as clear as day that the government is going to win the election.

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