(often with up) To make or become sober.

(often with up) To overcome or lose a state of intoxication.

“It took him hours to sober up.”

To moderate one's feelings

Not drunk; not intoxicated

Not given to excessive drinking of alcohol

“1890, John Charles, The Godly, Righteous, And Sober Life”

Moderate; realistic; serious; not playful; not passionate; cool; self-controlled