If your dream involved shielding or defending someone else, you can be sure your trust is well placed.
If you defended yourself or someone else defended you, you should avoid forcing any important issues for the time being, as someone you count on for support could suddenly fail you.
Defending anything in a dream is protecting it spiritually, perhaps from contamination or from penetration. Defending any type of sacred space would have this meaning.
Material aspects: Putting up a defence, perhaps a wall or barrier, signifies that we feel threatened in some way. We may have to justify our position over a situation in our waking lives.
Islamic Dream Interpretation