Overexpose in harsh lighting?

I thought I would take advantage of the great expertise in this forum to ask what might be a dumb question. I was shooting in an urban environment with another photographer on a very bright and harsh day. He said in that situation he overexposes his 400 film by one stop and underdevelops. I understand the underdeveloping part but I'm not sure of why you would overexpose in this situation (assuming the meter and your judgement are correct).

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