Islamic Interpretation of Dreams (Ibn-i Sirin):
(Harness; Headgear; Reins of power; Restraint; Rope) In a dream, a bridle represents a wife, a battlefield, or a sickness.
A bridle in a dream also means obedience, servitude or submission and wealth in the hands of the one who sees himself holding it.
If a traveller sees a bridle in a dream, it means slow coming news from home.
Ifa sick person sees the bridle of a horse in his dream, it means shattering of his hopes.
If a traveller sees a bridle in his dream, it means being forsaken by others.
A bridle in a dream also could mean protection from sin.
(Also see Rein)