Fishwife

A loud, coarse woman, and dates in this sense from the mid-1600s. Originally, however, a fishwife was simply a woman who sold fish, and this literal meaning dates from 1523, according to the OED. 'Wife' in Anglo-Saxon times simply meant 'woman', and only came to signify a married woman a short while later in the 11th century. Fresh fish is, of course, a highly perishable commodity and has to be sold quickly. The women who sold fish in the markets and in the streets would do so loudly to attract buyers, which by the mid-1600s triggered its current meaning and usage.