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to sever the connection―cut off the communication―(between the two)
to establish a connection (with something)
to sever the connection (between the two―with the other)―cut off the communication (between the two―with the other)
to contract a friendship with one―form an acquaintance with a person―make one's acquaintance
接触すると
when it comes into contact
have the connection undone
to make peace with the enemy―come to an amicable settlement