Also means
to screen
Usage Note
filtrer is used concretely for passing a liquid through a filter and figuratively for vetting calls, emails, or information. Filtrer les appels (to screen calls) is a very common expression. The related noun is filtre (filter), and filtration is used in technical contexts.
Examples
"Il filtre tous ses appels avant de répondre."
Natural Translation
He screens all his calls before answering.
Related Words
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