To make alive; to vivify; to revive or resuscitate, as from death or an inanimate state; hence, to excite; to, stimulate; to incite.

To come to life; to become alive; to become vivified or enlivened; hence, to exhibit signs of life; to move, as the fetus in the womb.

give life or energy to; "The cold water invigorated him"

show signs of life; "the fetus quickened"

To make lively, active, or sprightly; to impart additional energy to; to stimulate; to make quick or rapid; to hasten; to accelerate; as, to quicken one's steps or thoughts; to quicken one's departure or speed.

To move with rapidity or activity; to become accelerated; as, his pulse quickened.

move faster; "The car accelerated"