The line refers to those who are draining the strength and resources of England, just as a leech drains blood from its host.
The line "But leachlike to their fainting country" can be found in the poem "England" by William Blake. This line refers to certain individuals who are described as leachlike, meaning they are draining or exploiting their own country. The word "leach" is used metaphorically to convey the idea that these individuals are parasitic, sucking the life and resources out of their nation. The term "fainting country" suggests that the country is weak, depleted, or in decline as a result of these exploitative individuals.
