
And now for something completely different.
An irreversible binomial is a pair of words joined by a conjunction – usually and – that always appears in the same order. The order is ‘locked in’ due to factors such as rhythm, frequency, phonology, or conventional usage.


This meme courtesy of Nicky Mee
Comments
I'd say "off and on" is more common that "on and off."
I knew a burly guy in college who was sexually omniverous. He was large and bi.