昼
チュウ, ひる

daytime, noon

JLPT4 G2 S9 F1115

The relevant seal inscription form combines an abbreviated form# of 書 (written work) + 日 sun/day surrounded by straight lines on all four sides → (written) demarcation of sunshine from darkness → *noon*; *afternoon*; *daytime*. 晝 eliminates the two vertical strokes toward the bottom of the character.

[Full Kanji Etymology List]