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To shake or otherwise move something soft or plush so that it becomes (or at least looks) fluffier. A noun or pronoun can be used between "fluff" and "up." I fluffed up the pillows on the couch before our guests got here.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fluff something up
to make something soft appear fuller or higher. Fluff your pillow up before you go to bed. She fluffed up her pillow before retiring.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To shake or ruffle something, especially something with feathers or fur, to make it softer, puffier, or larger: When my canary fluffs up its feathers, it looks round and fat. I fluffed up the cat's fur with a hairbrush. The pillows will be more comfortable if you let me fluff them up.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.