cut on the underside of a branch or stem being removed to prevent unwanted tearing as the part being removed falls.

Merriam-Webster Online Dictionary
undercut (verb)
transitive verb
to cut away the of - underpart undercut a vein of ore
to cut away material from the of (an object) so as to leave an overhanging portion in relief - underside
to offer to sell at lower prices than or to work for lower wages than (a competitor)
to cut obliquely into (a tree) below the main cut and on the side toward which the tree will fall
to strike (a ball) with a downward glancing blow so as to give a backspin or elevation to the shot
intransitive verb
to or destroy the force, value, or effectiveness of - undermine inflation undercuts consumer buying power to perform the action of cutting away beneath
undercut (noun)
British - tenderloin
the action or result of cutting away from the or lower part of something - underside
a notch cut in the base of a tree before felling to determine the direction of falling and to prevent splitting
undercut (Wikipedia)

Undercut may refer to:

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