tatamiser

to be or to become Japanese in culture or style; to Japanize

“Dès lors, elle est saisie d'une rage d'apprendre: non pour denevir japonaise, se ‘tatamiser’ comme disent les Occidentaux, mais pour comprendre et communiquer.” — From that time, she was seized with a passion to learn: not to become Japanese, to ‘nipponize’ as they say in the West, but to understand and communicate.

From tatami + -iser, from Japanese 畳 (“tatami mat”).