A more thorough explanation:

A lethal weapon is a type of weapon that is designed or used to cause serious injury or death to a person. It can be any object or device that has the potential to cause harm, including firearms, knives, explosives, and chemicals.

For example, a gun is considered a lethal weapon because it is designed to fire bullets that can cause serious injury or death. Similarly, a knife can be a lethal weapon if it is used to stab or cut someone.

It is important to note that the term "lethal weapon" is often used interchangeably with "deadly weapon" or "dangerous weapon." These terms all refer to weapons that have the potential to cause harm.

In some cases, certain weapons may be considered "lethal weapons per se," meaning that they are inherently deadly and do not require any additional evidence to prove their potential for harm. For example, a grenade or other explosive device would be considered a lethal weapon per se.

Overall, the term "lethal weapon" is used to describe any type of weapon that has the potential to cause serious harm or death to a person. It is important to handle these weapons with care and to use them only in situations where they are necessary for self-defense or other legitimate purposes.