cast off
cast off {v.}
1a. or cast loose
To unfasten; untie; let loose (as a rope holding a boat).
The captain of the boat cast off the line and we were soon out in open water.
1b. To untie a rope holding a boat or something suggesting a boat.
We cast off and set sail at 6 A.M.
2. To knit the last row of stitches.
When she had knitted the twentieth row of stitches she cast off.
3. To say that you do not know (someone) any more; not accept as a relative or friend.
Mr. Jones cast off his daughter when she married against his wishes.
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Source: A Dictionary of American Idioms
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