Deliver a physical blow, forceful comment, or reprimand to, as in The judge often socks it to the jury in a murder case. This idiom uses sock in the sense of “strike hard.” It is also put as an imperative, as in Sock it to them, kid! or Sock it to me!, which is sometimes used to give encouragement but can also have sexual overtones. [Second half of 1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.