15. The system as defined in claim 10 wherein the processor further includes: computer readable code for generating an N-best list for the utterance, the N-best list including a plurality of possible utterances, each of which potentially corresponds with the utterance, wherein each of the plurality of possible utterances is ranked according to a confidence score; and computer readable code for identifying a first-best possible utterance from the N-best list, wherein the first-best possible utterance does not contain the particular expression.
15. The system as defined in claim 10 wherein the processor further includes: computer readable code for generating an N-best list for the utterance, the N-best list including a plurality of possible utterances, each of which potentially corresponds with the utterance, wherein each of the plurality of possible utterances is ranked according to a confidence score; and computer readable code for identifying a first-best possible utterance from the N-best list, wherein the first-best possible utterance does not contain the particular expression. 16. The system as defined in claim 15 , further comprising an audio component configured to present, in response to a command from the processor, the first-best possible utterance to a source of the utterance.