Refuse to support, dislike, as in I hold no brief for liars. This term is a negative version of the legal expression hold a brief for, meaning [to support or defend a position by argument.] The noun brief has been used in this way since the 1200s.
Source: The American Heritage� Dictionary of Idioms by Christine Ammer.
Copyright � 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company.