rack 1 
(răk)
(răk)n.
1.
a. A framework or stand in or on which to hold, hang, or display various articles: a trophy rack; a rack for baseball bats in the dugout; a drying rack for laundry.
b. Games A triangular frame for arranging billiard or pool balls at the start of a game.
c. A receptacle for livestock feed.
d. A frame for holding bombs in an aircraft.
2. Slang
a. A bunk or bed.
b. Sleep: tried to get some rack.
3. A toothed bar that meshes with a gearwheel, pinion, or other toothed machine part.
4.
a. A state of intense anguish.
b. A cause of intense anguish.
5. An instrument of torture on which the victim's body was stretched.
6. A pair of antlers.
7. Vulgar Slang A woman's breasts.
tr.v. racked, rack·ing, racks
Phrasal Verbs: 1. To place (billiard balls, for example) in a rack.
2. also wrack To cause great physical or mental suffering to: Pain racked his entire body. See Synonyms at afflict.
3. To torture by means of the rack.
rack out Slang
To go to sleep or get some sleep.
rack up Informal
Idioms: To accumulate or score: rack up points.
off the rack
Ready-made. Used of clothing.
on the rack
Under great stress.
rack (one's) brains/brain
To try hard to remember or think of something.
[Middle English rakke, probably from Middle Dutch rec, framework; see reg- in the Appendix of Indo-European roots.]
racker n.