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sponge (something) off (of) (someone or something)
To beg, borrow, or obtain as a handout (something, usually money or food) from someone or something else. My brother's been sponging off my parents ever since he dropped out of college. My roommate's a nice woman, but she's always sponging food off of me, and I don't have the heart to tell her to stop.
mod. thirsty. I gotta get a drink, man. I’m sponged!
See also: sponge