From shiyth; scrub or trash, i.e. Wild growth of weeds or briers (as if put on the field) -- thorns.
see HEBREW shiyth
H7898. shayith
שַׁ֫יִת noun [masculine] collective thorn-bushes (connection with above √ dubious; DietrAbh.73 compare (improbable) שׁאה devastate, אִיָּה ruin, whence ׳שׁ wild, rough growth); — always with שָׁמִיר: absolute ׳שׁ Isaiah 7:23-24, 9:17; 27:4 (compare Du); שָׁ֑יִת 5:6; 7:25; suffix שִׁיתוֺ 10:17 (figurative of Assyr.).