Definitions

1. verb

to remove sap from the base of a tree, often to prevent it from rising to the top and spoiling the timber, especially in woodworking.

“The forester instructed the young apprentice on how to undersap the tree safely.”

2. noun

a device or tool used for removing sap from a tree, especially in woodworking.

“The old undersap was no longer effective and needed to be replaced.”