the.com/copycat

means Someone who imitates another person's actions, style, or ideas instead of coming up with their own.

from A straightforward compound from 'copy' plus 'cat' — likely riffing on the cat's reputation as a sly mimic, watching and repeating what it sees. The term shows up in American English in the 1800s, originally as schoolyard slang aimed at kids who just parroted someone else's work, and it never really left the playground.