phrase umbilical cord
If you say
that one person, organization, or country has cut
its umbilical cord
with another, you mean that they have done something that makes them more independent
The referendum will bring Puerto Rico one step closer to cutting the island's umbilical
cord to the United States.
I will never forget all you've done for me, but it's time to cut the umbilical cord.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers