Once you sign away something, the decision is usually final and cannot be undone.

Irreversible Action

The phrase often implies serious legal consequences, so it should be used with awareness of the implications.

Legal Consequences

'Sign away' involves a formal written document; it's not just a verbal agreement.

The phrase suggests a possibility of regret for giving control without fully realizing the outcome.

Using 'sign away' indicates that once done, you lose any control over the thing signed away.

Think about how signing away something now may affect your long-term interests or objectives.