Usage Note
Approfondir is used both concretely (to make a trench deeper) and, far more commonly, figuratively, meaning to examine or develop something more thoroughly. The related adjective approfondi (thorough, in-depth) is especially common in academic or professional contexts, as in une analyse approfondie.
Examples
"Il faut approfondir nos recherches sur ce sujet."
Natural Translation
We need to go deeper into our research on this subject.
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