𢘇 (old form of 怛)

It is a historical variant of 怛.

Shuowen, a character dictionary from the Han dynasty, records 𢘇 as an alternate form of 怛, a character for grief or distress. It puts 心 (“heart/mind”) beneath 旦, rearranging the parts of the same word.

Shuowen quotes 信誓𢘇𢘇 in a note on the Book of Odes, an early Chinese poetry collection. Its familiar line is 信誓旦旦, a phrase for earnest, trustworthy vows. The speaker remembers a promise before her partner’s betrayal, making the line’s confidence painful irony. Chinese scholar Duan Yucai’s commentary reads 旦 here as borrowed writing for 𢘇.