engorge itself on (someone or something)
Of an insect or animal, to drink and fill itself with blood. The tick had already engorged itself on your blood by the time we discovered it on your body.
engorge itself on (something)
1. Of an insect or animal, to fill its body to excess with something it has eaten or drunk, especially blood. The tick had already engorged itself on your blood by the time we discovered it on your body.
2. By extension, to greedily consume, hoard, or take advantage of a huge number or amount of something. The private equity firm engorged itself on the investments of millions of unsuspecting consumers. The political campaign is engorging itself on the fears and anxieties of the population.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
engorge (itself) on someone or somethingand 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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.