The bit is something that goes in the horses mouth so the rider can steer the horse. So free from the bit probably means that the bit fell out of the horses mouth.
Wikipedia can tell you more: http://en.wikipedia.org/wiki/Bit_(horse)
The saliva is mixing around the bit and gets foamy and gross.
If you mean the Horse Whisperer, he is a bit south of the docks on the fringe of the jungle.
She struggled to complete the marathon, but with determination and perseverance, she crossed the finish line.
This is a horse term. A horse that is eager to move will chew or chomp at the bit in its mouth, and pull on the reins to try to get the rider to let him move. If you are chomping at the bit, you are eager to get started on something.
A little bit faster than a trot.
The device that is place in the horses mouth is called a bit. It is a bar of metal used to steer the horse when riding.
Above the means the horse is avoiding the pressure and may grab the bit with his tetth and take off.
A bit lifter is a piece of horse tack which lifts a bit in the horse's mouth.
I'm not familiar with a 'headpiece' but I think you mean the bridle. This is used to control the horse's head and keeps the bit in the horse's mouth.
I think you mean off the bit. This means that the horse's head isn't collected and isn't forward enough. The way I generally get my horse on the bit is to squeeze and half halt until he is moving forward and tucks his head under Hope this helped!
A harsh bit is not the solution for a horse that bolts. Proper training is.
Each horse prefers a different type of bit and it's up to the owner to figure out what type of bit the horse likes best.