"Be authority" can have several antonyms, depending on the context it is used in. In some cases, "be submissive" or "be obedient" can be antonyms, suggesting someone has given up their authority or control. Alternatively, "be rebel" or "be a dissenter" can be antonyms, indicating someone is actively challenging and resisting authority. Other antonyms could include "be humble" or "be modest," which suggest a lack of arrogance or entitlement. In any case, antonyms for "be authority" are used to describe individuals or situations where authority is absent, diminished, or challenged.