From Longman Dictionary of Contemporary Englishsober up phrasal verbDRUNKto gradually become less drunk, or to make someone become less drunk I had sobered up by now and felt terrible.sober somebody ↔ up Some coffee should sober you up. → sober→ See Verb table
Examples from the Corpus
sober up• Give her a little time to sober up.• He didn't sober up till he'd had a cup of strong coffee. 