sober as a judge
Not at all intoxicated, quite clear-headed, as in Even after three drinks he was sober as a judge. Why judges should be equated with sobriety is not known, but the simile was first recorded in 1694.
Words nearby sober as a judge
sob story,
sob stuff,
soba,
sobeit,
sober,
sober as a judge,
sober-headed,
sober-minded,
soberize,
sobers,
sobersided