have something against

Be opposed to, especially for a particular reason. For example, Do you have something against this plan? or Annie must have something against Mary, because she's always so surly when they're together.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.