IPA: /ˈspɪnɒf/
KK: /ˈspɪnˌɔf/
A new company or product that is created from an existing one, often based on a popular character or idea from a previous work.
The television series was a spinoff of the original show, featuring a character that fans loved.
Spinoff is formed from "spin" (from Old English "spinnan", meaning to twist or turn) and "off" (meaning away from). The word describes something that is created or derived from something else, as if it is spun off from the original source.
Think of something being 'twisted away' from its original source — 'spin' means to twist, and 'off' means away.