Jam-tomorrow Definition
noun
(idiomatic) Promised benefits that never arrive.
Wiktionary
Origin of Jam-tomorrow
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From Lewis Carroll's Through the Looking-Glass (1871), where Alice is offered “jam to-morrow and jam yesterday — but never jam to-day”. This is a pun on a mnemonic for the usage of iam in Latin (note i/j conflation in Latin spelling), which means “now”, but only in the future or past tense, not in the present (which is instead nunc).
From Wiktionary
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