From qashash; straw (as dry) -- stubble.
see HEBREW qashash
H7179. qash
קַר adjective cool; — construct (figurative) וְקַררֿוּחַ Proverbs 17:27 (Kt) cool of spirit, i.e. calm, self-possessed (Qr יְקַרֿ); plural קָרִים of water Jeremiah 18:14; Proverbs 25:25.
קַשׁ noun masculineNahum 1:10 stubble, chaff; — absolute ׳ק Exodus 5:12 +, קַ֑שׁ 15:7; — literal as accusative of congnate meaning with verb לַתֶּבֶן ק ׳לְקשֵׁשׁ 5:12 (J); in simile, as inflammable, 15:7; Isaiah 5:24; 47:14; Nahum 1:10; Joel 2:5, so in metaphor Isaiah 33:11; Obadiah 18; Malachi 3:19; in simile, as driven by wind 40:24; 41:2; Jeremiah 13:24; Psalm 83:14; figurative of the worthless Job 13:25, of harmless trifles 41:20; 41:21.