Where does “double” come from?

double (English) comes from French doublé, from Middle French double, from Old French doble, from Latin dūplus, from Proto-Italic *duplos.

double (English): A compound attack that deceives the opponent's...

Definitions

Step	Language	Word	Meaning
1	French	doublé	double, brace, pair; double; doublé
2	Middle French	double	—
3	Old French	doble	double
4	Latin	dūplus	—
5	Proto-Italic	*duplos	—

double — Etymology, Origin & Word History | Etymology Explorer