(biochemistry) Any of a group of proteins similar to ubiquitin / Initialism of rich urban biker.

(transitive) To move (one object) while maintaining contact with another object over some area, with pressure and friction. / (transitive) To rub something against (a second thing).

An act of rubbing. / A difficulty or problem. / (archaic) A quip or sarcastic remark. / In the game of crown green bowls, any obstacle by which a bowl is diverted from its normal course.

(informal) To add insult to injury; to emphasize one's strengths or another's weaknesses in a manner that degrades another.

(transitive) To apply by rubbing. / (transitive) Of butter, to mix in by rubbing. / (transitive, idiomatic) To make a point in an irritatingly emphatic manner.

simple past tense and past participle of rub

(cooking) Having had a substance applied through rubbing.

An impression of an embossed or incised surface made by placing a piece of paper over it and rubbing with graphite, crayon or other coloring agent.

present participle of rub

Third-person singular simple present indicative form of rub