Question

how did the processes of ginning, spinning, knitting, and retting got thier names ??

Answer 1

Ginning, spinning, knitting and retting are the steps involved in textile manufacturing. Each of them is named after the machine in which the above processes are performed.
Ginning is performed in cotton gin.
Spinning is done in cotton spinning machine.
Knitting is done in circular knitting machine.
Similarly retting is done in retting machine.