沸き わき boiling Also a form of 沸く わく stem to grow hot (e.g. water) N4 Meanings noun boiling Its kanji 沸 フツ · わ.く、わ.かす seethe, boil, ferment, uproar, breed In sentences Furigana お湯ゆが沸わき始はじめた。 The water began to boil. #2508369