Reading books keeps your grey matter active.
grey matter
idiomBrains; a person's ability to think.
The puzzle was designed to challenge your grey matter and improve your problem-solving skills.
Years of studying philosophy had sharpened his grey matter, allowing him to dissect arguments with surgical precision.
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get grey hair from
To acquire great frustration, confusion, or anxiousness from (something or someone).
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give someone grey hair
To give someone great frustration, confusion, or anxiousness.
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gray hat
A morally ambiguous character; an antihero.
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grey area
An area intermediate between two mutually exclusive states or categories, where the border between the two is fuzzy or ill-defined.
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grey cells
Brains; a person's ability to think, especially referring to intelligence.
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grey power
The collective political, economic, and social influence of senior citizens, especially when they are mobilized by a common interest.
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matter at hand
The current issue, which requires immediate attention.
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matter of course
A natural or logical outcome; perforce.