One of the mysteries of the English language finally explained.
Synonyms of quicken in English:
quicken
See definition of quicken
verb
1‘his pulse quickened’
SYNONYMS
speed up, accelerate, step up, hasten, hurry, hurry up
informal gee up
ANTONYMS
slow
2‘the film quickened his interest in wild life’
SYNONYMS
stimulate, excite, stir up, arouse, rouse, waken, animate, activate, incite, galvanize, instigate, whet, inspire, kindle, fan, refresh, strengthen, invigorate, reanimate, reactivate, revive, revitalize, resuscitate, revivify
titillate, tempt
ANTONYMS
dull