Meaning of “sober” in the English Dictionary

"sober" in British English

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soberadjective

uk /ˈsəʊ.bər/ us /ˈsoʊ.bɚ/

sober adjective (NOT DRUNK)

C2 not drunk or affected by alcohol:

Are you sober enough to drive, Jim?
I'd had no wine all evening so I was stone cold (= completely) sober.

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soberverb [ I or T ]

uk /ˈsəʊ.bər/ us /ˈsoʊ.bɚ/

(Definition of “sober” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sober" in American English

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soberadjective

us /ˈsoʊ·bər/

sober adjective (NOT DRUNK)

having had no alcohol; not drunk

sober adjective (SERIOUS)

serious and calm:

The sober expression had not left Martin’s face.

(Definition of “sober” from the Cambridge Academic Content Dictionary © Cambridge University Press)