from The Century Dictionary and Cyclopedia
- Not slipping; not liable to slip.
Sorry, no etymologies found.
A light line has been thrown over each stay, and been thrown repeatedly around so as to form an unslipping knot.
If thou art weary already, what wilt thou be when the Noose is fixt, and no kind relieving Hand can do thee the curtesy of unslipping it.
"Passengers were unslipping their flight harnesses, organizing luggage and tapecases and personal effects.