noun
high noon; midday
Refers to the time around noon when the sun is at its peak, often emphasizing heat or brightness.
日盛りに外を歩くのは危険だ。
It's dangerous to walk outside at high noon.
日盛りの時間帯は日陰で休もう。
Let's rest in the shade during the midday hours.
真昼 is a more general term for midday or broad daylight, while 日盛り specifically emphasizes the peak heat and brightness of the sun.
Compound of 日 (hi, 'sun') and 盛り (sakari, 'peak, height'), with rendaku voicing of the second element.