fly on the wall

英語

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名詞

fly on the wall (複數 flies on the wall)

1. (俗語) 旁觀者，（暗中的）見證者，偷看者
   • 1918, "Clark Would Draft Even Men of 68," New York Times, 9 Aug., p. 11 (retrieved 28 Oct. 2008),

     James W. Gerard, ex-Ambassador to Germany, the first speaker of the evening, said that at that moment he would like to be a fly on the wall of the palace at Potsdam to hear what the Potsdam gang were saying about our soldiers.