Someone in your life whom you feel tends to hide their feelings or to not communicate very openly (as a mustache can obscure the mouth).
An attempt to hide or alter one’s identity.
A manly mustache on a woman can represent your perception (or imagining) of the woman as having a physical, emotional, or mental trait you associate with masculinity, the idea of someone (or of women in general) not conforming with societal “feminine” norms, a blurring or overlooking of gender boundaries.
A mustache on a man can represent: someone you know who has a mustache, your attitude or preference about men having mustaches (consider how you felt about the mustache).
If a woman dreams of admiring a mustache, her virtue is in danger, and she should be mindful of her conduct.
If a man dreams that he has his mustache shaved, he will try to turn from evil companions and pleasures, and seek to reinstate himself in former positions of honor. [2]
If it is a stranger, the warning concerns the proposed work or projects that you will receive shortly. But if it is yourself who has a mustache (provided that in real life you do not) the dream indicates that you are fooling yourself.
To see long whiskers announces upcoming luck; short ones, disease; gray ones, serenity. [3]
Folklore: Unimportant squabble. [8]