PJ Ex17:12 :וידוי דמשה הוו יקרין‏ :
See the entire entry for yqr vb. to be heavy

PJ Ex17:12 : ואהרן וחור מסעדין לידוי‏ : while Aaron and Hur were assisting his arms
See the entire entry for sˁd vb. to help, to aid