開いた口がふさがらない あいたくちがふさがらない Also written 開いた口が塞がらない Meanings Expression, い-adjective dumbfounded; speechless; flabbergasted; openmouthed (with surprise) Kanji 開 open. Read as あく. 口 mouth. Read as くち. Word lists Idioms Jinuma: Japanese Dictionary · Word lists