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v. Present participle of percolate.

"But another idea that has been percolating is making the stress tests — which were just performed on the nation’s 19 largest banks — a permanent feature of the regulatory regime."

percolated    percolates    percolating   

trickle    dribble    filter    filtrate    recuperate   

percolator    percolation   

percolated    percolating   

filter    strain    exude