As defined in the MISC@1 , the `` bridle '' includes both the headstall that holds a bit that goes in the mouth of a horse , and the reins that are attached to the bit .

The bridle includes the headstall -LRB- that goes around the horse 's head -RRB- and holds a bit that goes in the mouth of a horse , and also the reins that are joined to the bit .
