Off by one.
Off his rocker/trolley.
Oil doesn't reach his dipstick.
On permanent leave of absence from his senses.
On the batting end of a no-hitter.
One bit short of a byte/word.
One board short of a porch.
One boot stuck in the sand.
One bumper/rail short of a bank shot.
One bun/donut short of a dozen.
One car short of a chase scene.
One card/marble shy of a full deck.
One chip short of a megabyte.
One clearance short of landing/taking off.
One color short of color-coordinated.
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