A peg is a small hook or knob that is attached to a wall or door and is used for hanging things on.

A peg is a small device which you use to fasten clothes to a washing line.

A peg is a small piece of wood or metal that is used for fastening something to something else.

If you peg something somewhere or peg it down, you fix it there with pegs.

If a price or amount of something is pegged at a particular level, it is fixed at that level.

If you say that someone should be brought down a peg or be taken down a peg, you mean that they should be made to realize that they are not so important or wonderful as they think they are.

Off-the-peg clothes are made in large numbers and sent to shops, not made specially for a particular person.

If you describe someone as a square peg in a round hole, you mean that they are in a situation or doing something that does not suit them at all.