a usu knitted covering for the foot extending above the ankle and sometimes to the knee
an insole for a shoe
a light shoe worn by actors in comedy in ancient Greece and Rome
then to the well-trod stage anon, if Jonson's learned sock be on — Milton
blow/knock one's socks off
informal to surprise or impress one overwhelmingly
pull one's socks up
informal to make a determined effort to do better
put a sock in it
Brit, informal to stop talking
[Old English socc light shoe, via Latin soccus from Greek sukkhos]