Which verb means 'to weaken'?

• A. Reinforce
• B. Empower
• C. Undermine
• D. Support

Answer: (C)

The verb that means 'to weaken' is "undermine." When something is undermined, it is gradually weakened or damaged, often in a subtle or indirect way. This term is frequently used in contexts where the strength or stability of something is compromised, such as undermining someone's confidence or authority. In contrast, the other choices convey meanings that are associated with strengthening, helping, or bolstering rather than weakening. For example, "reinforce" means to strengthen or support, while "empower" indicates giving someone the authority or power to do something. "Support" also relates to providing assistance or strength. Thus, "undermine" specifically captures the essence of weakening, making it the correct choice in this context.