KanjiJLPT N4
Daytime

daytime, noon

Mnemonic

A monk begins playing the shakuhachi at daybreak, and its haunting notes stretch on and on through every sunlit hour of daytime. The flute's melody rides the sunlight itself, lasting until the sky finally dims. As long as the shakuhachi plays, daybreak never ends.
Additional thoughts
Picture the bamboo flute's sound as a visible thread of golden light — the shakuhachi literally sustains the sun overhead. When the music stops, night falls.
Quick recall
A shakuhachi played from daybreak sustains the entire daytime with its melody.

Details

The keyword for 昼 is daytime. This kanji refers to the period of the day when the sun is up, spanning from sunrise to sunset. It represents the bright, sunlit hours as opposed to nighttime, and is used to describe midday or the general concept of daylight hours. It often carries connotations of the middle of the day, particularly around noon.
On'yomi
ちゅう
Kun'yomi
ひる