Definition of sober-up in English English dictionary
become more realistic; "After thinking about the potential consequences of his plan, he sobered up"
become sober after excessive alcohol consumption; "Keep him in bed until he sobers up"
If someone sobers up, or if something sobers them up, they become sober after being drunk. He was left to sober up in a police cell. the idea that a cup of strong black coffee sobers you up
become more realistic; "After thinking about the potential consequences of his plan, he sobered up