quickener

transitive verb

1. to animate; enliven; revive
2. to arouse; stimulate; stir
3. to cause to move more rapidly; hasten

intransitive verb

1. to become enlivened; revive
2. 1. to begin to show signs of life, as a fetus in the womb
   2. to enter the stage of pregnancy in which the movement of the fetus can be felt
3. to become more rapid; speed up: the pulse quickens with fear