A primitive root; properly, to eliminate, i.e. (intransitively) to dry up -- fail.
נָשַׁת verb be dry, parched; —
Qal Perfect3feminine singular נָשָׁ֑תָּה בַּצָּמָא לְשׁוֺנָם Isaiah 41:17 (on dagesh forte affect. see Ges§ 20i); also figurative גְבוּרָתָם נָָֽשְׁתָה Jeremiah 51:30, their might is dry, i.e. fails.
Niph`al Perfect3plural consecutive מֵהַיָּ֑ם וְנִשְּׁתומַֿיִם Isaiah 19:5 and water shall be dried up from the sea; compare Imperfect מַיּם יַנָָּֽתְשׁוּ Jeremiah 18:14, where read probably יִנָָּֽשְׁחוּ (Gf Gie and others).