i presume you want to know what this means, its like the phrase "slippery slope". as soon as one act occurs it will either lead to much more acts similar but worse, or the consequences from that first act will spread and get increasingly worse.
When you begin to drive a wooden wedge under an object you are trying to lift, the major problem is getting it started: in other words, getting the 'thin end of the wedge' under the object. Once you have the thin end in place, the rest is inevitable and much easier - you keep driving the wedge until it's all the way in place. So the 'thin end of the wedge' is the difficult start of a process which will inevitably lead to something much more significant happening.
A is a wedge.
A Wedge
The current MacBook Air is a wedge shape that is 0.11 inch at the thin end and 0.68 inch at the thick end.
The wedge is used to collect and transports energy to the pointy end. In this way, enough stress is put on a thin area.
If the object is of the same width and tapers from thick to thin, it may be a wedge.
A thin film having zero thickness at one end and progressively increasing thickness at other end is called a wedge shaped film
A chisel is a type of machine called a wedge. A wedge is a simple machine that consists of two inclined planes, giving it a thin end and a thick end. Force is applied to the thick end of the wedge, and the sloping sides of the wedge apply force to the object, cutting/splitting it apart. A wedge makes work easier by increasing the force applied to the object, although it applies the force over a shorter distance. Another example of a wedge is a hammer.
A wedge
A wedge can look brown, tan, any color if you paint it. It can be thick, thin, big, or small.
A knife, which is a special form of a wedge.
ABS and Rockport are both brands of shoes. A wedge is a shoe with a sole that is thick at the heel and thin at the toes.