曰
エツ, いわ.く, のたま.う, のたま.わく, ここに, ひらび
say, reason, pretext, history, past, flat sun radical (no. 73)
JLPT0 G13 S0 F5000
As per
一
# (fullness) +
口
mouth → mouth figuratively filled with words → *say*; *speech indicator*.
[Full Kanji Etymology List]