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Run-out is a term used to describe when the angles of the wood fibers are not parallel to the edge of the board. Almost every plank will have some run-out. “Lots of run-out” is when a lot of the plank has the grain running off at an angle (the plank is not cut correctly for steam bending or that part of the tree was curved, twisted, or has branches or knots). “Really bad run-out” is when the angle of grain is over about 20 degrees, which will make it harder to bend without it breaking, limiting the tightness of the bend possible.