noun, adverb
Refers to the middle of the day, often with a nuance of bright, full daylight. Can be used as a noun or adverbially.
真昼の太陽が照りつけている。
The midday sun is beating down.
真昼から酒を飲むなんて、どうかしている。
Drinking alcohol in broad daylight is crazy.
Compound of 真 (ま, 'true, just') and 昼 (ひる, 'daytime, noon'), literally 'true noon'.