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English definition of “jam tomorrow”

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jam tomorrow

UK
something good that is promised but never happens: As children we were always being promised jam tomorrow, if only we would be patient.
Translations of “jam tomorrow”
in Chinese (Traditional) 許而不予的好東西,可望不可及的東西…
in Chinese (Simplified) 许而不予的好东西,可望不可及的东西…
(Definition of jam tomorrow from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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