1
general::
Phrase(s): engorge (itself) on someone or something [and] engorge (itself) with something
[for an animal] to drink its fill of blood. • The vampire bat engorged itself on a number of creatures last night. • Mosquitoes engorge on human victims. • The mosquitoes engorged themselves with my blood all night long.
McGrawhill's American Idioms And Phrasal Verbs