Definition of murk noun from the Oxford Advanced Learner's Dictionary

 

murk

 noun
noun
BrE BrE//mɜːk//
 
; NAmE NAmE//mɜːrk//
 
(also the murk)[uncountable]
 
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darkness caused by smoke, fog, etc. synonym gloom The figure disappeared into the murk. Through the murk there was a faint glimmer of light. Word Origin Old English mirce, of Germanic origin; reinforced in Middle English by Old Norse myrkr.
See the Oxford Advanced American Dictionary entry: murk