The term SHUTS IN can be solved by four different crossword solutions: ENCLOSES (8 letters), PENS (4 letters), COOPSUP (7 letters), and IMMURES (7 letters). ENCLOSES means to surround or confine something, while PENS means to enclose an area with a fence. COOPSUP is an archaic term meaning to shut in or confine, and IMMURES is another archaic term meaning to wall up or enclose. All of these terms refer to the act of shutting something in or confining it.