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To take some fluid from something. A noun or pronoun can be used between "draw" and "off." I had to draw off some of the water so that the glass didn't overflow.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
draw something off (from something)
to remove a portion of a liquid from something; to cause something to flow from something. The steward drew some wine off from the cask. He drew off some wine.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.