Verb
To close, seal, or end something by tying a knot.
To close (something) with string, thread, etc.
The surgeon tied off the vein.
He allegedly took his tie off and balled it into his fist and walked past the security barriers stating, “Do what you need to do. Source: Internet
They are barely able to remove their belongings from the home as the water comes rushing up, and have to tie off the house, which floats right off its foundation. Source: Internet