Vassalize is a term that refers to the act of subjecting a person or a state to a feudal lord, thereby making them subservient to the lord. There are several synonyms for vassalize, which include subjugate, subordinate, enslave, dominate, control, conquer, and colonize. These words all describe a situation where one entity gains control over another, either by force or by manipulation. Vassalize is a term that originated in medieval times when feudal lords exerted their control over the land and people under their domain. Although the use of the word has evolved over time, its essence remains the same: a powerful entity exerting its dominance over a weaker one.