(typography) the iteration mark 〻, used to repeat kanji, historically mostly kanji with kun'yomi

double room

(linguistics) doublet

going back to sleep (e.g. after waking up in the morning)

(idiomatic) unhesitatingly without dispute

multiple citizenship

being roundabout or indirect to the point of being ineffective, often irritatingly so

serve a second master

in kambun, a type of kaeriten in which the reading order is marked with numbers 1, 2, 3... indicating the order

(rare) duality