What is the meaning of Borer?

A tool used for drilling.

 A knife fit for a stabbing.

A person who bores or drills; a person employed to drill bore holes.

A tedious person, who bores others; a bore.

An insect or insect larva that bores into wood.

One of the many types of mollusc that bore into soft rock.

A cyclostome, such as a hagfish, which bores into injured, dead, or decaying sea creatures to feed on their flesh.

present of bore

drill bit

drill

Source: wiktionary.org