system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is it that some words over time shift to meaning essentially the opposite of their original intent

Not, for example, "bad" from the 80s which didn't lose its original meaning and was mostly self aware, but instead words like "terrific" which is ~never used in relation to terror.  Do most languages have these?
gpt
Kind of how "literally" is becoming to mean "figuratively". It has been (mis)used for emphasis so much the original meaning is starting to be lost.

Terrific meant something that evokes terror, the mechanism for its transition is likely the same. People used it for emphasis ("The food was so good it was scary") and the meaning gradually changed.