To draw (stitches etc.) tight.
Origin of yark
- From Middle English ȝarken, ȝerken, from Old English ġearcian (“to prepare, make ready, procure, furnish, supply”), from Proto-Germanic *garwakōną (“to prepare”), from Proto-Indo-European *gʰrebʰ-, *gʰerbʰ- (“to grab, take, rake”), equivalent to yare + -k. Related to Old English ġearc (“ready, active, quick”), Old English ġearu (“prepared, ready, equipped, complete, finished, yare”). More at yare.
- Origin uncertain, probably originally imitative; compare jerk etc.