Customary way of speaking or acting; fashion, manner, practice (often used formerly in such phrases as "at his own guise"; that is, in his own fashion, to suit himself.)

External appearance in manner or dress; appropriate indication or expression; garb; shape.

Misleading appearance; cover, cloak.

“Under the guise of patriotism”

To dress.

To act as a guiser; to go dressed up in a parade etc.