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English definition of “nailing jelly to the wall”

nailing jelly to the wall

trying to give exact details for something that it is not possible to know about exactly: Writing the history of this period is like nailing jelly to the wall.
(Definition of nailing jelly to the wall from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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Translations of “nailing jelly to the wall”

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