An act of rubbing.
"The researcher isolated rub, a protein that functions similarly to ubiquitin in tagging damaged cells for destruction."
Any of a group of proteins similar to ubiquitin
In plain English: A rub is an uncomfortable feeling of friction between two surfaces rubbing against each other.
"The rough texture of sandpaper rubbed her hands raw, but she kept working to finish the job."
To move (one object) while maintaining contact with another object over some area, with pressure and friction.
"She rubbed her hands together to warm them up before stepping out into the cold wind."
In plain English: To rub something means to move it back and forth against another surface, often with pressure.
"He rubbed his hands together to warm them up before going outside."
Usage: Use this word to describe moving an object back and forth or in circles against a surface using firm pressure, such as rubbing hands together for warmth. It often implies the goal of cleaning, polishing, or causing irritation through that specific friction-based motion.
The word rub comes from Middle English with an unknown origin that may ultimately trace back to a Proto-Germanic root meaning "to tear." It entered the language as part of a family of Germanic words shared across various dialects and languages, including Dutch and Scandinavian tongues.