Which term means to give a sketchy outline of or foreshadow?

Adumbrate is the term that means to give a sketchy outline or to foreshadow. It originates from the Latin word "adumbratus," which translates to "to shade" or "to cast a shadow." In a figurative sense, when someone adumbrates, they present only a partial or incomplete representation of something, hinting at what is to come without detailing it fully. This usage is common in literature and discourse when an author or speaker suggests themes or events that will unfold later on, providing just enough information to intrigue the audience.

The other terms do not carry the same meaning. Illuminate refers to making something clear or easier to understand, which does not align with the idea of providing an incomplete outline. Describe involves giving a detailed account or explanation, which is contrary to the concept of a sketchy outline. Clarify means to make something less confused and more comprehensible, which again does not connect with the notion of foreshadowing or presenting an incomplete view. Thus, adumbrate stands out as the term specifically designed to convey the act of outlining or hinting at future elements without providing full details.