Definitions
1.NounA customary way of speaking or acting; a fashion, a manner, a practice (often used formerly in such phrases as "at his own guise"; that is, in his own fashion, to suit himself.)
2.NounAn external appearance in manner or dress; an appropriate indication or expression; a garb; a shape.
3.NounA misleading appearance; a cover, a cloak."Under the guise of patriotism"
4.VerbTo dress.
5.VerbTo act as a guiser; to go dressed up in a parade etc.
6.NounDeliberate misspelling of guys."Sup guise? — What's up, guys?"