What is (a) A knob made on a rope with spun yarn or parceling to prevent a running eye from slipping. (b) Same as 2d Mousing, 2 called?

mouse — (Naut.) (a) A knob made on a rope with spun yarn or parceling to prevent a running eye from slipping. (b) Same as 2d Mousing, 2. (Webster's 1913.)

Sources