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Related to bridle up: unbridling
1. To fit a bridle to an animal, especially a horse. A noun or pronoun can be used between "bridle" and "up." You'd best go bridle the horses up so we can get a move on. This is my first time bridling up the new colt, so I'm a little nervous.
2. To exude anger, offense, or indignation in reaction to something. Often followed by "at something." She bridled up when I suggested that she had been responsible for the accident. I know you'll probably bridle up at this, but please hear me out.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.