1. A method comprising: providing a lexicon; receiving a spoken utterance of a word or phrase; after receiving the spoken utterance, obtaining an initial pronunciation for the spoken utterance; after obtaining the initial pronunciation, modifying the initial pronunciation to generate a plurality of alternative pronunciations; using the received spoken utterance to score each of the pronunciations among the plurality of alternative pronunciations; identifying a highest scoring pronunciation among the plurality of alternative pronunciations; and updating the lexicon with the highest scoring pronunciation.
14. The method of claim 1 , further comprising using the lexicon to perform recognition on the spoken utterance to generate a recognized transcript of the spoken utterance, said recognized transcript being characterized by a corresponding pronunciation, and wherein the initial pronunciation is different from said corresponding pronunciation for the recognized transcript.