くち ひら
kuchio hiraku

Godan Verb (ku)
Expression

1. to open one's mouth (to talk); to (start to) tell

わたくし くち ひらくとすぐに彼女 かのじょ わたくしをさえぎった。
watashiwa kuchio hirakuto suguni kanojoga watashio saegitta
I had hardly opened my mouth, when she interrupted me.