WordReference English-Spanish Dictionary © 2014:

Principal Translations
al revés loc advlocución adverbial: Unidad léxica estable formada de dos o más palabras que funciona como adverbio ("en vilo", "de seguido", "a quemarropa"). (al contrario)backwards, turned around, reversed advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
  inside out advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
  upside down advadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
  the other way around exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
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WordReference English-Spanish Dictionary © 2014:

Compound Forms:
al revés de loc preplocución preposicional: Unidad léxica estable formada de dos o más palabras que funciona como preposición ("a favor de", "en torno a"). (al contrario de)contrary to preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours."
  as opposed to preppreposition: Relates noun or pronoun to another element of sentence--for example, "a picture of John," "She walked from my house to yours."
sino al revés  (US)the other way around exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
  (UK)the other way round exprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
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'al reves' found in these entries
In the Spanish description:
English:

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