This is an enjoyable discussion, thank you Alum Ladd! One good outcome is to use the word pressure appropriately:
Perpendicular to the surface is the key here.
Pressure is an important part of technique. Many shavers start out with too much pressure and have to learn a lighter touch. There are many other factors to one's technique - angle, stroke speed, length of stroke, force of that stroke, directions with respect to grain, and much more.
Pressure is the amount of force applied perpendicular to the surface of an object per unit area. (wikipedia)
Perpendicular to the surface is the key here.
Pressure is an important part of technique. Many shavers start out with too much pressure and have to learn a lighter touch. There are many other factors to one's technique - angle, stroke speed, length of stroke, force of that stroke, directions with respect to grain, and much more.