B2to give a new appearance to a person or thing, especially in order to hide its true form: He disguised himself by wearing a false beard.Minor skin imperfections can usually be disguised with a spot of make-up.We tried to disguise the fact that it was just a school hall by putting up coloured lights and balloons.Hiding and disguisingC2to hide an opinion, a feeling, etc.: I couldn't disguise my disappointment.Hiding and disguising