TgJ Is47:15 :עוּבָדֵי שִקרִיך דַהוֵית מִתעַסְקָא בְהוֹן מִיָנְקוּתִיך‏ : your false actions that you used to do business with [MT: סֹחֲרַיִךְ] since your youth
See the entire entry for ˁsq vb. to be difficult; to be occupied with