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English definition of “sober”

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sober

adjective 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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sober adjective (SERIOUS)

C2 serious and calm: In fact the whole wedding was a sober affair - no dancing, just people standing around in groups chatting politely. Anthony was in a very sober mood - I scarcely heard him laugh all night.

sober adjective (NOT BRIGHT)

C2 Clothes or colours that are sober are plain and not bright.

sober

verb [I or T] uk   /ˈsəʊ.bər/ us    /ˈsoʊ.bɚ/
to become more calm and serious, or to make someone do this: News of the tragedy sobered us.
Phrasal verbs
(Definition of sober from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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