Definition of いわんこっちゃない
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(exp) I told you so
「おい。走ると危ないぞ」「え？・・・わっ、わ、うわわ〜〜〜っ」「あーあー、言わんこっちゃない」
"Hey! It's dangerous to run here." "Eh? ... A-a-Aaah!!" "Oh dear, what did I tell you?"
