Meaning of “nailing jelly to the wall” in the English Dictionary

british dictionary

"nailing jelly to the wall" in British English

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nailing jelly to the wall

UK US nailing Jell-O 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 Learner’s Dictionary & Thesaurus © Cambridge University Press)