A liquid that has been percolated.
To pass a liquid through a porous substance; to filter.
To drain or seep through a porous substance.
Water percolates through sand.
To make (coffee) in a percolator.
I'll percolate some coffee.
To spread slowly or gradually; to slowly become noticed or realised.
Reports on the pitiful state of many prisons have finally percolated through to the Home Office, which has promised to look into the situation.