Lomit'sa v otkrytuyu dver' - lit. "to kick in an unlocked door". To insistently explain or prove something that is already obvious and non-contentious. Used since the the 19th century, and apparently taken off the French 'enfoncer une porte ouverte."
I've heard that one. In its French form. This is awfully well researched considering how short the entries are.
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