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Quote:

Recently i heard someone say .... as serious as dead man ..... [...] i have also heard the usage ...dead serious...what about this phrase?



I've never heard serious as a dead man before, but it's obviously a (very bad) play on dead serious (where, by the way, dead means not deceased but complete; absolute re "we sat in dead silence.")



Or was it, "as serious as dead, man?" Your post, tuhin, is ambiguous.