devise: v. to invent sth new or a new way of doing sth;

grudge:n. a feeling of anger or dislike towards sb because of sth bad they have done to you in the past;v. 1、to do or give sth unwillingly;2、to think that sb does not deserve to have sth;

infiltrate: v. to enter or make sb enter a place or an organization secretly, especially in order to get information that can be used against it;2、infiltrate (into) sth (technical) (especially of liquids or gases) to pass slowly into sth;