If you wedge something, you force it to remain in a particular position by holding it there tightly or by fixing something next to it to prevent it from moving.

If you wedge something somewhere, you fit it there tightly.

A wedge is an object with one pointed edge and one thick edge, which you put under a door to keep it firmly in position.

A wedge is a piece of metal with a pointed edge which is used for splitting a material such as stone or wood, by being hammered into a crack in the material.

A wedge of something such as fruit or cheese is a piece of it that has a thick triangular shape.

If someone drives a wedge between two people who are close, they cause ill feelings between them in order to weaken their relationship.

If you say that something is the thin end of the wedge, you mean that it appears to be unimportant at the moment, but that it is the beginning of a bigger, more harmful development.