To "fend" means to:

The term "fend" specifically refers to the act of warding off or defending against something, typically an attack or threat. It is often used in contexts where someone needs to protect themselves or something else from harm or danger. For example, one might fend off an aggressive animal or fend off criticism in a discussion. The essence of the word encapsulates a proactive approach to dealing with situations that require defense or protection.

Other choices suggest different meanings that do not align with the primary definition of "fend." Assisting eagerly implies a helpful or supportive action, while engaging openly suggests a willingness to participate or confront. Ignoring an attack, on the other hand, does not involve any defensive action and instead suggests passivity. Thus, the correct understanding of "fend" is explicitly tied to the idea of defense or warding off something unwanted or harmful.