present participle of read up on

(transitive) To sneakily arrive near someone in a position to startle them; to startle someone by creeping up behind them.

(transitive, informal, slang) To approach with the intention of seducing; make sexual advances toward.

(transitive) To approach with speed or forceful intensity / (transitive) To confront with hostility

(idiomatic, slang) To come to, visit.

present participle of rub up on

Third-person singular simple present indicative form of rub up on

simple past tense and past participle of rub up on

simple past tense and past participle of push up on

present participle of push up on