A framework or structure on or in which an apparatus is mounted, usually by means of shelves or mounting plates Also known as a bay or a chassis
If you rack your brains, you try very hard to think of something. She began to rack her brains to remember what had happened at the nursing home
To stretch or strain, in a figurative sense; hence, to harass, or oppress by extortion
obtain by coercion or intimidation; "They extorted money from the executive by threatening to reveal his past to the company boss"; "They squeezed money from the owner of the business by threatening him"
A bar with teeth on its face, or edge, to work with those of a wheel, pinion, or worm, which is to drive it or be driven by it