What does it mean for something bad to 'befall' someone?

To 'befall' someone means for something to happen or occur to that person, often something unfortunate or negative. The term generally carries a connotation of events that take place by chance or fate. Thus, when used in a sentence, it often implies that an adverse or undesired event has affected an individual.

The other options differ significantly in meaning. Creating a positive experience or influencing someone positively does not align with the context of 'befall,' which typically refers to negative events. Additionally, while 'happen unexpectedly' might seem somewhat relevant in certain contexts, it lacks the specificity of occurrence to an individual that the correct choice provides. Therefore, the meaning of 'befall' is best encapsulated by the idea of something occurring to a person.