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)