An aquatic blood-sucking annelid of class Hirudinea, especially Hirudo medicinalis.

A person who derives profit from others in a parasitic fashion.

A glass tube designed for drawing blood from damaged tissue by means of a vacuum.

To apply a leech medicinally, so that it sucks blood from the patient.

To drain (resources) without giving back.

“Bert leeched hundreds of files from the BBS, but never uploaded anything in return.”