Definition of the word sit for

The phrase "sit for" has its roots in the Middle English period, where it was used to indicate that someone was remaining in one position in order to have their portrait or likeness taken by an artist. The exact origin of the term is unclear, as it's similar to other expressions that have developed over time, such as the Old French word "setter" and the Old Norse term "sitta," which both share a similar meaning of "to sit" or "to remain still." The phrase "sit for" gained popularity in the English language during the 18th century, when portrait painting became a popular art form. Throughout the centuries, this expression has had varying meanings, but in general, it's come to describe any situation where someone remains stationary for a specific purpose, such as taking a photograph or answering a series of test questions in a classroom setting. In summary, the origin of the phrase "sit for" can be traced back to the Middle English era, where it was used to indicate that someone was staying still for an artist to create a portrait. Over time, it's evolved to mean that someone is keeping a stationary position for various purposes beyond just having their likeness captured on canvas.