The phrase "robust debate" means having a strong, passionate, and lively discussion where different opinions are expressed and challenged. Full definition
What is at stake is whether our society intends to maintain a reasonable amount of open and robust debate about issues of consequence. (religion-online.org)
Why this happens is a topic of robust debate in nutritional circles. (mindbodygreen.com)
I am a firm believer in the power of robust debate among intelligent people who have a diverse view. (lawyer-monthly.com)