割り増し わりまし Also written 割増, 割増し Meanings Noun, の-adjective, する verb, Transitive extra (charge, fare, etc.); premium; bonus; (after a number) tenths increase Kanji 割 divide. Read as わり. 増 increase. Read as まし. Words containing 割り増し 割り増し金 (わりましきん) premium Jinuma: Japanese Dictionary · Word lists