caution (one) against (someone or something)(redirected from caution against him)
caution (one) against (someone or something)
To warn one about someone or something. My mom always cautions me against texting while driving. You need to caution him against Allie before he falls prey to her usual tricks.
See also: caution
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.