What does "sober" mean?

Additional senses

1. 2.Not mad or insane; not wild, visionary, or heated with passion; exercising cool, dispassionate reason; self-controlled; self- possessed. There was not a sober person to be had; all was tempestuous and blustering. Druden. No sober man would put himself into danger for the applause of escaping without breaking his neck. Dryden.
2. 3.Not proceeding from, or attended with, passion; calm; as, sober judgment; a man in his sober senses.
3. 4.Serious or subdued in demeanor, habit, appearance, or color; solemn; grave; sedate. What parts gay France from sober Spain Prior. See her sober over a sampler, or gay over a jointed baby. Pope. Twilight gray Had in her sober livery all things clad. Milton. See Grave.
4. 5.To make sober. There shallow draughts intoxicate the brain, And drinking largely sobers us again. Pope.
5. 6.To become sober; -- often with down. Vance gradually sobered down. Ld. Lytton.