What it means

1. adjective directed or facing toward the back or rear
   “a backward view”
2. adjective (used of temperament or behavior) marked by a retiring nature
   “a backward lover”
3. adjective having made less than normal progress
   “an economically backward country”
4. adjective retarded in intellectual development
5. adverb in a manner or order or direction the reverse of normal
   “it's easy to get the `i' and the `e' backward in words like `seize' and `siege'”
6. adverb in or to or toward a past time
   “set the clocks back an hour”
7. adverb at or to or toward the back or rear
   “he moved back”