Meaning of “what more do you want - jam on it?” in the English Dictionary

british dictionary

"what more do you want - jam on it?" in British English

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what more do you want - jam on it?

UK informal

used to say that someone should be grateful for what they have or have been offered, and not demand something better:

They've given him a holiday in Italy. What more does he want - jam on it?

(Definition of “what more do you want - jam on it?” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)