Definition of (as) plain as day
- The answer is (as) plain as day.
: an extensive area of level or rolling treeless country
: a broad unbroken expanse
: something free from artifice, ornament, or extraneous matter
: even, level
: lacking ornament : undecorated
: free of extraneous matter : pure
: in a plain manner : without obscurity or ambiguity
: the time of light between one night and the next
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