rack

1 :  a framework for holding fodder for livestock

2 :  an instrument of torture on which a body is stretched

3a (1) :  a cause of anguish or pain (2) :  acute sufferingb :  the action of straining or wrenching

4 :  a framework, stand, or grating on or in which articles are placed

5a :  a bar with teeth on one face for gearing with a pinion or worm gear to transform rotary motion to linear motion or vice versa (as in an automobile steering mechanism)b :  a notched bar used as a ratchet to engage with a pawl, click, or detent

6 :  a pair of antlers

7 :  a triangular frame used to set up the balls in a pool game; also :  the balls as set up

8 :  bed, sack

1 :  to torture on the rack

2 :  to cause to suffer torture, pain, anguish, or ruin

3a :  to stretch or strain violentlyb :  to raise (rents) oppressivelyc :  to harass or oppress with high rents or extortions

4 :  to work or treat (material) on a rack

5 :  to work by a rack and pinion or worm so as to extend or contract rack a camera

6 :  to seize (ropes, such as parallel ropes of a tackle) together

7 :  to place (balls, such as pool balls) in a rack

:  to become forced out of shape or out of plumb