Hi Rajivme If you want something more than dictionary definitions for each of those words, you will have to give us the sentence and/or context you found "but obviously" in. Otherwise, the only thing I can tell you is that "but obviously" is not an idiom, and you can look up the definitions of the individual words here .
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Anonymousthe other guy replies " of course there is , that's but obvious. "It should be, "Of course there is, but that's obvious".