The term 'fix firmly in place' can be broken down into four crossword solutions: SET (3 letters), IMBED (5 letters), EMBED (5 letters), and ENSCONCE (8 letters). To SET something means to put it in a particular position or arrangement. To IMBED or EMBED something is to fix it firmly in a surrounding mass, such as embedding a nail in wood. To ENSCONCE something is to settle it securely or snugly in a place. All of these terms refer to the action of fixing something firmly in place.