(UK, intransitive, informal) To study in detail; to familiarize oneself with all available information.
I find the doctors are very surprised when they realise I'm genned up about my condition.
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(UK, transitive, informal) To inform or teach with all relevant details; to brief.
So the heroic infant was able to gen up on all she needed to know about the making of bathtub gin by consulting a selection of large and impressive volumes in the reference section.
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