JMdict: 1276570

口走る 【くちばしる】

  1. [v5r,vt] to blurt out; to let slip; to say inadvertently; to come out with (e.g. nonsense)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Mouth コウ, ク くち
Run ソウ はし.る