(idiomatic) To test completely; to exercise the full range of abilities or functions.

(dated) To speed up, travel faster; also, to adjust one's speed to match that of a companion.

To begin moving or working faster.

(literally) To direct a horse to walk, canter, trot, etc. / (idiomatic) To test several or all functions or training of a person, animal, machine, etc.

plural of pacesetter

A person who determines the rate of action through leading.

Defining a pace