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![MerriamWebster Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::97040343.png) Merriam-Webster [@MerriamWebster](/creator/twitter/MerriamWebster) on x 1.1M followers
Created: 2025-07-16 17:03:52 UTC

Some words go together like jelly and peanut butter… wait, that sounds super weird.

A pair of words that is used in a fixed order in an idiomatic expression is called an ‘irreversible binomial.’

‘Peanut butter and jelly’ is an example of an irreversible binomial.
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**Related Topics**
[jelly](/topic/jelly)

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