JMdict: 1202650

開口一番 【かいこういちばん】

  1. [adv] at the very beginning of one's speech; immediately upon opening one's mouth (to speak); before anything else; first of all
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
開 Open, Unfold, Unseal カイ ひら.く, ひら.き, -びら.き, ひら.ける, あ.く, あ.ける 3
口 Mouth コウ, ク くち 1
一 One, One Radical (no.1) イチ, イツ ひと-, ひと.つ 1
番 Turn, Number In A Series バン つが.い 2