Which term describes hiding under a false appearance?

The term that best describes hiding under a false appearance is "dissemble." This word specifically refers to the act of concealing one's true motives, feelings, or beliefs, often by pretending to be someone different or by presenting a misleading facade. In contexts of deception, dissembling involves carefully crafting a false impression to mislead others, which aligns perfectly with the notion of hiding under a false appearance.

The other terms do not convey the same meaning. "Display" involves showcasing or exhibiting something out in the open, often with transparency. "Reveal" means to make something known that was previously kept secret or hidden, which is the opposite of hiding. "Expose" refers to uncovering something that was concealed, also contrary to the idea of hiding under a false appearance. Therefore, "dissemble" is the most accurate choice for the concept of creating a misleading or deceptive impression.