The answer is backhand and down. Milady's shaving-area reference chart lists this exact movement — from the angle of the mouth toward the point of the chin — with the stroke labeled backhand and the direction labeled down.
This chart is one of several in the chapter mapping each of the 14 defined shaving areas to a specific stroke type and direction, since the same facial region can call for a different stroke depending on which direction the barber is moving across it. This particular mouth-to-chin movement is specifically a backhand, downward stroke.
Milady Standard Barbering, 6th ed., Ch. 13 (Shaving and Facial-Hair Design), p. 342: "Milady's shaving-area chart lists: 'From angle of mouth toward point of chin — Backhand — Down.'"
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