noun which may take the genitive case particle 'no', taru-adjective, adverb taking the 'to' particle
openly in broad daylight; brazenly in public
Describes an action done without shame or concealment during the day, often with a negative or audacious connotation. Can be used adjectivally with の or adverbially with と.
The criminal brazenly broke into the bank in broad daylight.
The blatant cheating in broad daylight was exposed.
真っ昼間 is a colloquial noun meaning 'broad daylight' or 'midday', but it does not carry the adverbial/adjectival brazenness of 白昼堂々.
Standard kanji spelling using 堂々.
Alternate kanji spelling using 堂堂; less common but still encountered.
Compound of 白昼 (broad daylight) and 堂々 (magnificent, imposing, or openly). The combination yields the sense of doing something openly and unashamedly in the middle of the day.