accent (the manner of speaking or pronouncing peculiar to a community)
Unknown. Perhaps from dialectal Arabic *صَوْتَك (*ṣōtak, “your voice”), corresponding to standard صَوْتُكَ (ṣawtuka). According to the Houaiss Dictionary, first attested in the early 18th century.
Practice speaking and memorizing "sotaque" and many other words and sentences in Portuguese.