From an unused root meaning to pour; an outpouring -- stream.
H793. eshed
אֶ֫שֶׁד noun [masculine] foundation, bottom, lower part (slope) (Assyrian išdu compare LotzTP 186; > others from אֲשַׁד, pour, Sabean אסד = מסקי (משׁקה) DHMZMG 1883, 8, whence fall, slope; compare Di Numbers 21:15) ׳א הַנְּחָלִים the bottom of the ravines 21:15.