phonetic modification meaning in Hindi

Examples

1. It has also been suggested that " gabr " might be a mispronunciation of Arabic " kafir " " unbeliever, " but this theory has been rejected on linguistic grounds both phonetic and semantic : " there is no unusual sound in " kafir " that would require phonetic modification ",
2. The modern name " Sacav�m " might have come from the Arabic language; for many years experts believed that it came from the word " a
   agabi " ( " next " or " in the neighbourhood "  in this case, of Lisbon, an important city even during Moorish period ) latinised to " sacabis,-is ", becoming " sacabem " in the accusative case, and hence, by phonetic modifications during the centuries, " Sacav�m ".