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coltostallion (Offline)
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Join Date: Mar 2011
07-18-2011, 04:15 AM

Quote:
Originally Posted by masaegu View Post
Knowing the meaning of each kanji will not help you understand an idomatic phrase like this just as an English-learner will not understand the phrase "You are pulling my leg." even if he is familiar with every word used in it.

大口を叩く means "to brag", "to talk big", etc.

大口叩いたじゃない = "You bragged about it, didn't ya?"

大口叩いてるのはどっちだ = "You are the one who talked big!"
Literally, it says "Which one (of us) talked big?" but we only use this structure 「~~したのはどっちだ」 when we mean "It is you who ~~." In other words, it is not a question despite its look. 
Thanks! I figured it had to be an idiom but I'm not sure where I could look something like that up