Lions use a combination of body posture and facial expressions to convey dominance or submission within their pride. When a lion wants to assert dominance, it will often stand tall with its head held high, puff up its chest, and maintain direct eye contact with the other lion or lions. The dominant lion may also make loud vocalizations such as roaring to establish its authority.
On the other hand, when a lion is displaying submission, it will often crouch down, lower its head, and avert its gaze from the dominant lion. The submissive lion may also make softer vocalizations or even emit low growls to signal deference.
Facial expressions also play a key role in communication within lion prides. A dominant lion may bare its teeth in a threatening manner to assert dominance, while a submissive lion may show the underside of its chin or neck as a sign of submission.
Overall, lions use a complex combination of body language and facial expressions to establish and maintain their social hierarchy within the pride.