From sha'ah; devastation -- desolation.
see HEBREW sha'ah
H7612. sheth
שֵׁאת noun feminine doubtful word; perhaps (for *שֶׁאֶת) din of battle (= שָׁאוֺן); Thes and others devastation, compare שְׁאִיָּה; either meaning suits ׳הַשּׁ Lamentations 3:47 ("" הַשָּׁ֑בֶר; but Wecompare Hex. 2, 351, from II. שׁוא, desolation); contracted (according to Thes and most) שֵׁת, in שֵׁת בְּנֵי Numbers 24:17 (J) sons of (battle-)din (warriors, = שָׁאוֺןבְּנֵי in "" Jeremiah 48:45); Vrss take שֵׁת here as proper name; Gray proposes שֵׂת = שְׂאֵת, pride, or reading as Jeremiah compare Wecomp. Hex.351.