A noose is a loop at the end of a rope that tightens when you pull it, used for catching animals or hanging people.
Nooses are usually associated with danger, harm, or death.
Examples:
The cowboy made a noose to catch the horse.
The noose tightened around the rabbit's neck.
He put the noose on the branch to catch the bad guys.
The noose was so big, it could catch an elephant!
In the old days, they used nooses to catch big animals.
She made a noose and pretended to catch her brother.