take someone down a peg (or two)

Also, 

take someone down a notch (or two); 

knock someone down a peg (or two); 

knock someone down a notch (or two)

(Fig) to reprimand someone who is acting too arrogant. 

• The teacher's scolding took Bob down a notch or two. 
• He was so rude that someone was bound to knock him down a peg or two.
  

... http://idioms.thefreedictionary.com/peg