tie off

phrasal verb

Definition of tie 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.

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tie off

transitive verb
\ˈtī-ˈȯf \
tied off; tying off or tieing off

Medical Definition of tie off 

: to close by means of an encircling or enveloping ligature tie off a bleeding vessel

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