All glove/no bat

What does "all glove/no bat" mean? My sense is that it means a player has only defensive capabilities, and no offensive skills. Can someone explain what it might mean more generally? I just read an article describing former-President George H. W. Bush as "an all-glove, no-bat first baseman".

I assume you're talking about this article [Dead link removed - ed]

GHW Bush was the captain of the baseball team in high school and at Yale. He played first base. It's a literal statement not some sort of allegorical dig.

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