Anyone with half a brain knows that fire is hot.
half a brain
idiomA very basic or minimal level of intelligence.
You do not need to be a genius to solve this; anyone with half a brain can figure it out.
The instructions were so incredibly straightforward that even a person with half a brain could have followed them without making a single error.
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all over hell's half acre
All over the place; everywhere.
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baker's half dozen
Seven, a group of seven.
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beat one's brain
To struggle to think or remember something.
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bend the brain
To be difficult to comprehend.
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bird of one's own brain
One's own idea or conception.
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brain blast
The moment of a sudden unexpected discovery.
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brain bucket
A protective helmet, as worn, for example, by a motorcyclist, bicyclist, or soldier in combat.
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brain candy
A narrative, commentary, etc. which amuses and holds one's attention, but which lacks intellectual depth or importance.