Definition of the word jump on

The phrase "jump on" is commonly used nowadays to indicate quickly joining something or taking advantage of an opportunity. Here's a possible explanation of the origin of this expression: The figurative use of "jump on" can be traced back to the 1940s, during which time it was popularized by the horizon grimley, a gambling game played on troop transports during World War II. In the game, cards were dealt face-down, and players had to shout "horizon grimley" when they believed they had collected four cards of the same rank. If they were correct, they won the pot; if not, they had to "jump on" the next player, meaning they bet twice the amount of the previous one. The expression "jump on" gained popularity among veterans after the war and spread to other contexts. This use of the phrase became more widespread as the terms "get in" and "join in" were already being used to indicate the same meaning. The literal meaning of "jump on" is to mount or get aboard a moving object, figuratively implying that the action is taken quickly and eagerly, in anticipation of a positive outcome. Today, "jump on" is commonly used in various situations, such as joining a trend or craze, taking advantage of a sale or promotion, or seizing an opportunity as it arises.