a thin smooth soft cloth made from very thin thread which is produced by a silkworm:
pure silk stockings
a beautiful dress in raw silk
2 [countable] British English lawSC
a very important lawyer [= Queen's Counsel (QC)]:
His practice quickly grew and he took silk (=became a QC) in 1988.
the coloured shirts worn by jockeys (=people who ride horses in races)
to make something good out of something that is bad quality