Probably <Frenchzest, interjection (1692 as zeste expressing quick movement; 1611 in Cotgrave expressing an act of hitting or shaking a person or thing), ultimately related to zestezestn.1
Meaning & use
Obsolete.
1705–22
Used to accompany or represent quick action or movement.
1705
Oons the old Woman—Zest.
J. Vanbrugh, Confederacyiii. i. 32
a1722
The hangman takes a..cloath..which he thrustes doune the throat of him..then zest with violence pules furth the cloath al ful of blood.