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engorge itself on (someone or something)

Of an insect or animal, to drink and fill itself with blood. Unfortunately, it looks like the tick had already engorged itself on your blood before we found it.
See also: engorge, itself, on

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.
See also: engorge, on