Where does “dubi” come from?

dubi (Esperanto) comes from Latin dubitō, from Latin dubō, from Latin *dubos, from Indo-European *bʰuH-.

dubi (Esperanto): to doubt; to question

Definitions

Step	Language	Word	Meaning
1	Latin	dubitō	—
2	Latin	dubō	—
3	Latin	*dubos	—
4	Indo-European	*bʰuH-	—

dubi — Etymology, Origin & Word History | Etymology Explorer