The word 阻止 is formed through the conceptual combination of its two constituent characters: 阻, which carries the core meaning of "to obstruct", "to block", or "to hinder", and 止, which means "to stop" or "to cease". They are merged not as a grammatical phrase but as a fused semantic unit, where the first character (阻) describes the method or action (obstructing) and the second (止) specifies the intended result (stopping). Together, they create a single, compound idea meaning "to prevent" or "to stop (someone from doing something)", where the obstruction is inherently for the purpose of causing cessation.