What is plump for? How to use in English

The phrase "plump for" originally comes from the game of plumbs, which was a popular parlor game in the mid-19th century. The game involved rolling bones or dice into a cup filled with plums or other small fruits. The object of the game was to carefully remove a plum from the cup without upsetting the remaining fruits. The verb "to plump" originally meant to roll bones or dice in a game like plumbs. Over time, the meaning of "to plump" changed to mean "to roll" or "to push" in general. The use of "to plump" in the sense of "to choose" or "to select" began in the late 19th century as a figurative extension of the original dice-rolling meaning. In the phrase "plump for," "plump" is being used in this latter sense of selecting or choosing. When we say "plump for option A," we are choosing or selecting option A in a similar way that we might plump for a specific plum in the game of plumbs. The popularity of the game of plumbs likely helped to cement the use of "plump" as a verb and aided in the evolution and spread of "plump for" as a figurative expression. Although the game of plumbs is largely forgotten today, the enduring use of "plump" in this sense continues to live on in modern English.