The term 'keeps in check' can be summarized by two crossword solutions: 'curbs' (5 letters) and 'DETERS' (6 letters). 'Curbs' is a noun that refers to a restraint or limitation, while 'DETERS' is a verb meaning to discourage or prevent someone from doing something. Both words imply a sense of control, as they suggest that something is being held back or prevented from happening. In this context, the term 'keeps in check' implies that something is being restrained or limited in order to maintain order or stability.