tie off

phrasal verb

tied off; tying off or tieing off; ties off

1

: to fasten or hold (something) by tying a knot or bow at its end

I finished knitting the last row and tied off the yarn.

2

: to close (something) with string, thread, etc.

The surgeon tied off the vein.

Medical Definition

tie off

transitive verb

ˈtī-ˈȯf 

tied off; tying off or tieing off

: to close by means of an encircling or enveloping ligature

tie off a bleeding vessel