1. ergative phrasal verb
If something such as a discussion broadens out or if someone broadens it out, the number of things or people that it includes or affects becomes greater.
[V P] ⇒ The debate is broadening out to include questions about the structure of French education.
[V n P] ⇒ We'll broaden the discussion out in a minute. [Also V P n (not pron)]
2. phrasal verb → broaden When something such as a river or road broadens out, it becomes wider.
[V P] ⇒ Here the Nile broadens out between the huge granite boulders.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers