Which word means to boast or brag about something?

The word "vaunt" means to boast or brag about something, which exactly fits the definition the question is looking for. When someone vaunts, they draw attention to their achievements or possessions in a way that is often excessive or ostentatious. This term is often used to convey a sense of pride or arrogance in the manner of self-promotion.

In contrast, "succor" refers to providing assistance or support in times of hardship, which does not relate to boasting. "Turpitude" describes a state of moral degradation or wickedness, and is not linked to bragging. Lastly, "supercilious" describes someone who behaves or looks as though they think they are superior to others, which might imply a certain arrogance but does not directly mean to boast about something. Thus, "vaunt" is the most precise term for the concept of boasting.