DJBA incorrectly "appropriate time" following a geonic interpretation. See now M. Geller, "Bloodletting in Babylonian Revisited",Aestimatio 3.1 (2022):85ff. We assume that there was a certain conflation (popular or otherwise) between the usages based on the Greek loanword (i.e., prs vb. : Dt to contrive; take pains < prws, pwrsˀ n.m. : method, strategy) and the common Semitic verb prs.