sap
/sæp/ noun C2- A narrow ditch or trench made from the foremost parallel toward the glacis or covert way of a besieged place by digging under cover of gabions, etc.
Plural saps
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Let what may remain of revolutionary sap exhaust itself and die away with the old trunk, and condescend only to regard the young shoot which has started up at a distance from the parent tree, without having the power, any more than the wish, to separate entirely from the stock from which it sprung.”
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