DeMundo 142:5 :ܡܛܠ ܕܒܚܐܦܐ ܚܝܨܐ ܘܐܡܝܢܐ ܢܚ݁ܬ ܥܠ ܐܪܥܐ‏ : because (the rain) falls on the ground with a robust and constant force
See the entire entry for ḥīṣ adj. firm, tightly constructed