The salute is often thought to date back to Roman times, but there is no evidence that soldiers raised their hand as a formal greeting. Another theory is that it originated in medieval Europe, when knights used their hands to raise their visors, revealing their identity to demonstrate they were friendly.
Macbeth in these lines is potrayed as a villian, which, of course, is what she is. So the words would, of course, be villanous.
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The quote might be saying that people who do not notice their actions may need to focus on their boundaries