Merriam-Webster's Collegiate® Dictionary, 11th Edition
BRISK
I. adjective
Etymology: probably modification of Middle French brusque
Date: 1560
keenly alert ; lively ,
2. pleasingly tangy , fresh , invigorating , sharp in tone or manner,
4. energetic , quick , marked by much activity , briskly adverb briskness noun
II. verb
Date: 1598
transitive verb to make brisk, intransitive verb to become brisk