A collar is the part of a shirt, jacket, or coat that fits around your neck. Some collars fold down neatly, like on a dress shirt or polo. Others stand up, like a turtleneck. The collar frames your face and often makes clothes look more finished and put-together.

The word also means to grab or catch someone, usually by their shirt collar. A teacher might collar a student running in the hallway, or a police officer might collar a suspect. The image is of catching someone firmly by the neck of their clothing.

For animals, a collar is a band that goes around a dog's or cat's neck, often holding identification tags or attaching to a leash.

In jobs, white-collar work happens in offices, like accounting or law, named for the white dress shirts professionals traditionally wore. Blue-collar work involves physical labor, like construction or manufacturing, named for the durable blue work shirts laborers traditionally wore. These terms describe categories of employment based on the type of work people do.

When someone is hot under the collar, they're getting angry or agitated, as if frustration makes your neck and face feel warm.