Wiktionary
bridle up
vb. To show anger or indignation; bristle at.
WordNet
bridle up
v. show anger or indignation; "She bristled at his insolent remarks" [syn: bristle at, bridle at, bristle up]
Usage examples of "bridle up".
He gathered the bridle up, and turned to glare down upon Mr Merriot.
When no new disasters occurred to me, I went and saddled Impossible but bundled his bridle up and tied it to the back of the saddle.
You'd use the canvas of your tent as a raincape, and hope it kept the worst of it off you, standing with your head down, one hand holding your horse's bridle up near his nose, the other holding the canvas just under your chin, shivering, both you and the horse.
Wilkins, the groom, led the animal by the bridle up and down before the library window.