The word 否决 is formed by combining two characters: 否, which carries the core meaning of "to deny" or "negation", and 决, which means "to decide" or "to determine". Their combination creates a logical and directional sequence where the act of deciding (决) is categorically negated or denied (否), thus directly producing the meaning "to veto" or "to reject". It is a straightforward conceptual synthesis where the first character modifies and dictates the outcome of the action expressed by the second.