rub

v.擦，摩擦；擦亮 n.擦，磨

royal blue, Royal Commission, Royal Highness, royal jelly, Royal Ordinance, royalist, royally, royalty, rpm, RRP, RSA, RSC, RSM, RSPB, RSPCA, RSV, RSVP, Rt Hon, Rt Rev (also Rt Revd), RU, rub (sb/oneself/sth) down, rub (sth) off, rub away, rub down, rub off, rub out, rub sb out, rub sth in/into sth, rub sth up, rubber, rubber goods, rubber plant, rubber stamp, rubber-neck, rubber-stamp, rubberize, rubberise, rubbery, rubbing, rubbish, rubbishy,