TgO Ex6:9 :וְלָא קַבִילוּ מִן מֹשַה מֵעְיָק רוּחַ וֻמִפוּלחָנָא דַהוָה קְשֵי עְלֵיהוֹן‏ : they did not accept it from Moses because of distress and the labor that was difficult for them
See the entire entry for ˁyāq, ˁyāqā v.n. pressure