Sentence:  In this instance, there is, upon the by, to be noted, the percolation or <WSD>suing</WSD> of the verjuice through the wood; for verjuice of itself would never have passed through the wood: so as, it seemeth, it must be first in a kind of vapour, before it pass.Webster 1913 
Meaning of the word marked with <WSD> tags:  The process of soaking through anything.