To seel means to sew up the eyes of a bird of prey, like a falcon, to keep it calm.
Seeling is an old practice in falconry, a way to keep the bird from getting too excited.
Examples:
The falconer will seel the falcon's eyes.
She seels the bird's eyes to keep it calm.
Seeling the falcon's eyes is an important part of training.
I seel my pet falcon's eyes so it won't get too excited.
In the old days, people would seel falcons to keep them calm.
The falconer seels the bird's eyes and then it's very calm.