Phonetic reversal

Phonetic reversal is the process of reversing the phonemes of a word or phrase. When the reversal is identical to the original, the word or phrase is called a phonetic palindrome. Phonetic reversal is not entirely identical to backmasking, which is specifically the reversal of recorded sound. This is because pronunciation in speech cause a reversed diphthong to sound different in either direction, or differently emphasize a consonant depending on where it lies in a word, hence creating an imperfect reversal. Backmasking involves not only the reversal of the order of phonemes, but the reversal of the phonemes themselves, which means that the reversed sound of a phrase may be hard to predict.

According to proponents of reverse speech, phonetic reversal occurs unknowingly during normal speech.