What is the meaning of dress down?

verb

• Censure severely or angrily.
  • usage: "The mother scolded the child for entering a stranger's car"; "The deputy ragged the Prime Minister"; "The customer dressed down the waiter for bringing cold soup"
  • synonyms: call on the carpet, take to task, rebuke, rag, trounce, reproof, lecture, reprimand, jaw, call down, scold, chide, berate, bawl out, remonstrate, chew out, chew up, have words, lambaste, lambast
• Dress informally and casually.
  • usage: "On Fridays, employees can underdress"
  • synonyms: underdress