I like this one:

This particle is a perfect ball bearing that can move at a single speed in one of six directions.

from "Feynman the Explainer" in:

https://longnow.org/essays/richard-feynman-connection-machin...

also:

"Don't say `reflected acoustic wave.' Say [echo]." Or, "Forget all that `local minima' stuff. Just say there's a bubble caught in the crystal and you have to shake it out." Nothing made him angrier than making something simple sound complicated.