fill (one's) head with (something)(redirected from fill their heads with)
fill (one's) head with (something)
To cause one to begin having particular thoughts or ideas. Everything she's said sounds like it's straight out of Pat's wacky schemes. He must be filling her head with crazy ideas.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fill someone's head with something
Fig. to put some kind of ideas into someone's head. Who's been filling your head with ideas like that? Mary has been filling my head with ideas about how to get rich.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.