To "succumb" means to what?

The term "succumb" specifically refers to yielding or giving way to a superior force, whether that force is physical, emotional, or situational. When someone succumbs, they are typically overwhelmed by circumstances, desires, or pressures they cannot resist, leading them to submit or give in. This concept applies in various contexts, such as surrendering to illness, temptation, or external influences.

In contrast, the other options imply active resistance or opposition. For instance, resisting vigorously suggests standing against something with strength; challenging authority indicates a confrontational stance; and standing firm against pressure highlights the act of remaining steadfast. These meanings stand in opposition to the notion of yielding inherent in "succumb." Hence, the correct answer captures the essence of the word by aligning with the idea of submission to an overpowering force.