ㄎㄡˇkǒuㄕㄨㄛshuōˊㄆㄧㄥˊpíng

  1. 不足拍案驚奇·○》:不必只是口說無憑朝奉。」紅樓夢·第一》:況且口說無憑文契。」一言為定有案可稽

(idiom)​ you can't rely on a verbal agreement, just because sb says sth, doesn't mean it's true