From Longman Dictionary of Contemporary Englishthe obvious thing (to do)the obvious thing (to do)BESTwhat clearly seems the best thing to do The obvious thing is to speak to her before you make a decision. → obvious
Examples from the Corpus
the obvious thing (to do)• But they haven't done the obvious thing and abandoned ship.• It would be the obvious thing to do under the circumstances.• I had always loved walking so it seemed the obvious thing to do.• Looking at it from a businessman's point of view, it's the obvious thing to do.• To drop it as soon as it was ready seemed natural, the obvious thing to do. 