WordReference Random House Learner's Dictionary of American English © 2017
rack•ing /ˈrækɪŋ/USA pronunciation  adj. [usually: before a noun]
  • causing great physical or mental pain or suffering:a racking headache.
  • rack•ing•ly, adv. 

    WordReference Random House Unabridged Dictionary of American English © 2017
    rack•ing  (raking),USA pronunciation n. [Masonry.]
    1. Buildingthe stepping back of the ends of courses successively from bottom to top in an unfinished wall to facilitate resumption of work or bonding with an intersecting wall.
    • rack1 + -ing1 1890–95

    'Racking' also found in these entries:
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