noun / verb
leash
LEESH/liːʃ/
A strap or cord for keeping an animal under control, or to restrain with one.
The leash connects securely to the dog's collar.

Etymology
The connection with “loose” seems to be a string held loosely. That image explains why a word for looseness could name a cord used to restrain a hound.
In context
this is used when we use leash pressure training with our dogs but we turn pressure on and when the dog complies we turn the pressure off
More examples
- Keep the dog leashed near the road.
- He held the leash loosely as they walked.
- The sign asked visitors to leash their pets.
Forms
leash · leashes · leashed · leashing