The term 'KILL BILLS' can be solved by the four-letter word 'VETO'. VETO is a Latin word meaning 'I forbid'. It is used to describe the power of a head of state, such as a president or monarch, to reject a proposed law or other measure. In the United States, the President has the power to VETO bills passed by Congress. This power is an important part of the system of checks and balances that ensures no one branch of government has too much power.