Ratchet n. : A pawl, click, or detent, for holding or propelling a ratchet wheel, or ratch, etc.

Ratchet n. : A mechanism composed of a ratchet wheel, or ratch, and pawl. See Ratchet wheel, below, and 2d Ratch.

Example:
What are all the Ratchet & Clank games starting with the first one to the newest up to today?

Taxonomy
Transformers, toy, Ratchet 2, Decepticons, Megatron, the Transformers, Ironhide, Bumblebee, List of Autobots, Cybertron, Optimus Prime, battle, Starscream, Universe, Earth, character, Jazz, Arcee.

Defination from the web:
Ratchet was named after the character of Nurse Ratched from the film ... Megatron made a deal - Ratchet would destroy Shockwave, and Megatron would free his comrades. ...