put-on

The term "put-on" originates from the phrasal verb "to put on," which has meant "to assume, to don" (as in clothing or a manner) since the late 14th century. By the early 19th century, this literal sense of placing something upon oneself evolved figuratively to mean adopting a false appearance or affectation. The transition from a physical action to a metaphor for deception is clear: just as one puts on a coat, one can put on an act or a false identity. The hyphenated noun and adjective forms, solidified in the 20th century, specifically denote something that is an assumed performance, a deception, or a joke played upon someone, capturing the essence of a consciously adopted pretense.

Structure: put (to place) + on (upon) put: From Middle English putten, puten, from Old English putian (to thrust, push). Its ultimate origin is uncertain but likely Germanic. In this compound, it functions as a verb root meaning "to place or set." on: From Old English on, an (in, on, upon), from Proto-Germanic ana. It functions as a prepositional particle indicating position or contact.