Rub It In

By Sandy Wood

Can you come up with an answer to today's open-ended mentalfloss.com Brain Game Free-for-All Friday challenge? Enjoy:
Give ONE example of an English word that either BEGINS or ENDS with the letter sequence "RUB." EXAMPLES: RUBBERNECK, SCRUB, RUBIDIUM Please add your single entry to our comment list below, and have a great weekend!