Yes, another shaving tip! I remember telling this to my younger daughter, and my older daughter exclaiming, “Hey! You never told ME that!”
When you shave your legs, you shave against the growth of the hair, to get a closer shave. Your underarm hair, however, grows in every direction – so you should shave your underarms in all directions (up, down, left, right, and even diagonal), to get a closer, smoother shave.