1peg 
/ˈpɛg/ noun
plural pegs /ˈpɛg/ noun [count] 1 : a small piece of wood, metal, or other material that is used to hold or fasten things or to hang things on
▪ Her coat hung on a peg by the door. ▪ a tent peg [=a pointed piece of wood or metal that is pushed into the ground to hold the corners of a tent in position] 2 : a wooden piece in a musical instrument (such as a violin) that is turned to tighten or loosen a string
▪ a tuning peg 3 Brit : clothespin
▪ Her coat hung on a peg by the door. ▪ a tent peg [=a pointed piece of wood or metal that is pushed into the ground to hold the corners of a tent in position]
▪ a tuning peg
a peg to hang something on
Brit : something (such as a fact or issue) that is used as support or a reason for something said or done
▪ He used the incident as a peg to hang his theory on.
▪ He used the incident as a peg to hang his theory on.
a square peg in a round hole
: someone who does not fit in a particular place or situation
▪ She felt like a square peg in a round hole at the new school until she made some new friends.
▪ She felt like a square peg in a round hole at the new school until she made some new friends.
off the peg
Brit : in a store where clothes are sold in different sizes that are not made to fit a particular person
▪ He bought that suit off the peg. [=(US) off the rack] — see also off-the-peg
▪ He bought that suit off the peg. [=(US) off the rack] — see also off-the-peg
take/knock/bring someone down a peg
: to make (someone) feel less important or proud
▪ He was taken down a peg when an even better player joined the team. ▪ She needs to be taken down a peg. [=humbled]
▪ He was taken down a peg when an even better player joined the team. ▪ She needs to be taken down a peg. [=humbled]
