World English Dictionary
rack1 (ræk)
1.  a framework for holding, carrying, or displaying a specific load or object: a plate rack; a hat rack; a hay rack; a luggage rack
2.  a toothed bar designed to engage a pinion to form a mechanism that will interconvert rotary and rectilinear motions
3.  a framework fixed to an aircraft for carrying bombs, rockets, etc
4.  the rack an instrument of torture that stretched the body of the victim
5.  a cause or state of mental or bodily stress, suffering, etc; anguish; torment (esp in the phrase on the rack)
6.  (US), (Canadian) in pool, snooker, etc
 a.  the triangular frame used to arrange the balls for the opening shot
 b.  Brit equivalent: frame the balls so grouped
7.  to torture on the rack
8.  Also: wrack to cause great stress or suffering to: guilt racked his conscience
9.  Also: wrack to strain or shake (something) violently, as by great physical force: the storm racked the town
10.  to place or arrange in or on a rack: to rack bottles of wine
11.  to move (parts of machinery or a mechanism) using a toothed rack
12.  to raise (rents) exorbitantly; rack-rent
13.  rack one's brains to strain in mental effort, esp to remember something or to find the solution to a problem
[C14 rekke, probably from Middle Dutch rec framework; related to Old High German recchen to stretch, Old Norse rekja to spread out]

Collins English Dictionary - Complete & Unabridged 10th Edition
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