Also means
to leak
Usage Note
Filtrar covers both 'to filter' (physically straining a liquid) and 'to leak' information, as when classified documents are filtrados to the press. The reflexive filtrarse means 'to seep through,' describing light or water penetrating a barrier. Context usually makes the sense clear.
Examples
"La luz se filtra por las persianas."
Natural Translation
The light filters through the blinds.

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