Sever ties/relations/connections/links etc (with/between somebody) verb phrase
To end a relationship
Mia has severed all ties with her sister for years.
The United States severed diplomatic relations with Cuba in 1961. Cuba and the US restored diplomatic relations on 20 July 2015.
The verb "sever" should be conjugated according to its tense.
Used to emphasize that someone or something is a lot more or a lot better
Mia can paint a damn sight better than I can.