Meaning: This sentence describes a referee using a whistle to signal the end of the game.
Choice of Words: The word "referee" refers to a person who is responsible for enforcing the rules of a game. "Blew" means to make a sound by forcing air out of the mouth. "Whistle" refers to a small device that makes a high-pitched sound when air is blown through it. "Stop" means to cause something to cease or come to an end. "Game" refers to an activity involving competition or amusement.