As a native speaker, I don't consciously decompose either "bear down" (in your sense) or "bear out" into component parts. To me, neither is very obviously composed of a particular meaning of "bear" plus a preposition. I think one would need to investigate the origins of these phrases to understand why they mean what they do.
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Rdep01Would you have any idea for "to bear out" ?
Rdep01ok, so there is not an explaination behind each phrasal verb ..