"a space of time," Old English frist, first "space of time" (cf. Old Frisian first, Old High German frist, Old Norse frest). As a verb, meaning "delay," from early 13c.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for frist
Fryst, or frist; to postpone possession or action,—the opposite of tryst.Letters of Samuel Rutherford