What do you mean, off the chain?

slip the leash

He finally broke free from the shackles of marriage. He finally got rid of the bondage of marriage.

Exempt from supervision

For example, they can work out of the chain. They can work completely freely.

wilderness

For example, when Jack found out that his girlfriend was cheating on him, he lost control.

Jack went crazy when he found that his girlfriend was half-hearted about him.

Very interesting

He prepared everything for the party, which was great.

He prepared all kinds of things for the party, which is really great!