quicken
quick-en
verb
To make something faster, or to increase in speed and activity.
"The pace of the walk began to quicken."
verb
To become alive or more lively, especially a foetus moving for the first time.
"She felt the baby quicken inside her."
Thesaurus
Synonyms: vivify, animate, revivify, renovate, repair, revive, reanimate, recreate, invigorate, whet, speed up, speed
Antonyms: decelerate, retard, slow, slow down, slow up