Collar-and-elbow is a type of wrestling move that looks like two people giving each other a big hug. But it's more than just a hug - the wrestlers use their arms to grab each other's necks and elbows. They try to push and pull each other around while still holding onto each other.
The name "collar-and-elbow" comes from the two places the wrestlers are grabbing onto each other - one arm around the neck (like a collar) and the other arm around the elbow. It's an old fashioned style of wrestling that used to be really popular a long time ago. Nowadays, it's mostly used for fun or in old timey wrestling competitions.
In collar-and-elbow, you can't just randomly grab onto the other person. There are rules to follow. The wrestlers usually start by standing a few feet apart, facing each other. When the referee says "go!", they can start grabbing onto each other. But there are certain things they can't do - like grabbing the other person's hair or going for the eyes.
The goal of collar-and-elbow is to force the other person out of the ring or onto the ground. It requires a lot of strength and skill to be successful. So next time you see wrestlers hugging each other like this, you'll know they are doing collar-and-elbow!