Wow! You resurrected an old thread with this question!
When a rider is referred to as being "dropped", it simply means that he is no longer able to maintain the pace of the peloton (or whatever group he may be riding with) and thus falls off the back, no longer able to keep up.
When a rider is referred to as being "dropped", it simply means that he is no longer able to maintain the pace of the peloton (or whatever group he may be riding with) and thus falls off the back, no longer able to keep up.