Definitions from Wiktionary ( )

▸ noun:  (uncountable, countable) Pliable material derived from the sap of the rubber tree; a hydrocarbon polymer of isoprene.
▸ noun:  (uncountable, countable) Synthetic materials with the same properties as natural rubber.
▸ noun:  (countable, Australia, India, Brunei, New Zealand, UK) An eraser.
▸ noun:  (countable, Canada, US, slang) A condom.
▸ noun:  (countable) Someone or something which rubs.
▸ noun:  One who rubs down horses.
▸ noun:  One who practises massage.
▸ noun:  A coarse towel for rubbing the body.
▸ noun:  An abrasive for rubbing with: a whetstone, file, or emery cloth, etc.
▸ noun:  (historical) The cushion of an electric machine.
▸ noun:  (countable, baseball) The rectangular pad on the pitcher's mound from which the pitcher must pitch.
▸ noun:  (Canada, US, in the plural) Water-resistant shoe covers, galoshes, overshoes.
▸ noun:  (uncountable, slang) Tires, particularly racing tires.
▸ noun:  (slang, dated) A hardship or misfortune.
▸ adjective:  (slang, of a draft/check) Not covered by funds on account.
▸ noun:  (sports) In relation to a series of games or matches between two competitors where the overall winner of the series is the competitor which wins a majority of the individual games or matches:
▸ noun:  The entire series, of an odd number of games or matches in which ties are impossible (especially a series of three games in bridge or whist).
▸ noun:  An individual match within the series (especially in racquet sports).
▸ noun:  (sports, Canada, US) A rubber match; a game or match played to break a tie.
▸ noun:  The game of rubber bridge.
▸ verb:  (telephony) To eavesdrop on a telephone call
▸ verb:  (slang) To rubberneck; to observe with unseemly curiosity.

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