From chashak; darkness; concretely, a dark place -- dark(-ness, place).
see HEBREW chashak
H4285. machshak
מַחְשַׁךְ noun masculine dark place (poetry) — absolute ׳מ Isaiah 29:15; 42:16; מַחְשָׁ֑ךְ Psalm 88:19; plural מַחֲשַׁכִּים Psalm 88:7; 143:3 = Lamentations 3:6 construct מַחֲשַׁכֵּי Psalm 74:20; — dark place:
a. = hiding-place אֿרץ׳מח Psalm 74:20.
b. dark region, in which men may lose their way Isaiah 42:16.
c. = grave, or שׁאול Psalm 88:19 (see Che); of dark place of God's wrath (like She' ô l) Psalm 88:7; compare 143:3 = Lamentations 3:6.
d. = secret place, secrecy (of plots) Isaiah 29:15.