draw off is a verb meaning "remove by drawing or pulling". It carries 2 recorded senses.
remove (a commodity) from (a supply source)
“She drew $2,000 from the account”
“The doctors drew medical supplies from the hospital's emergency bank”
Definitions, synonyms and semantic relations for draw off come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.