1a framework, typically with rails, bars, hooks, or pegs, for holding or storing things:a spice racka letter rack
an overhead shelf on a coach, train, or aircraft for stowing luggage.
a stack of digital effects units for a guitar or other instrument.
a vertically barred frame for holding animal fodder:a hay rack
2a cogged or toothed bar or rail engaging with a wheel or pinion, or using pegs to adjust the position of something:a steering rack
3 (the rack) historical an instrument of torture consisting of a frame on which the victim was stretched by turning rollers to which the wrists and ankles were tied.
4a triangular structure for positioning the balls in pool.
a single game of pool.
5North American informal a woman’s breasts:that chick’s got a nice rack
6North American a set of antlers:moose have the most impressive racks of all the antlered animals
7North American informal a bed.
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Universal
1 (also wrack) cause extreme pain, anguish, or distress to:he was racked with guilt
historical torture (someone) on the rack.
2 [with object and adverbial of place] place in or on a rack:the shoes were racked neatly beneath the dresses
3move by a rack and pinion.
4chiefly archaic raise (rent) above a fair or normal amount.See also rack rent.
oppress (a tenant) by exacting excessive rent.
go to rack (or wrack) and ruin
gradually deteriorate in condition because of neglect; fall into disrepair.
[rack from Old Englishwræc 'vengeance'; related to wreak]