The term 'KILLS BILLS' can be summarized by the crossword solution 'VETOES'. Veto is a Latin word meaning 'I forbid'. It is a power that allows a person, such as a president or governor, to reject a proposed law or bill. This power is used to prevent laws from being passed that the person believes are not in the best interest of the people. Therefore, the term 'KILLS BILLS' can be interpreted as the power of vetoing proposed laws, which can effectively kill them.