IPA: /ˈpriːvɜːrb/
KK: /ˈpriːvɜːrb/
A word or part of a word that is added before the main part of a verb to change its meaning.
In the word 'forget', the 'for-' is a preverb that modifies the meaning of the root verb.
Preverb is formed from "pre-" (meaning before) and "verb" (from Latin "verbum", meaning word). The term refers to a word that is placed before a verb to modify its meaning or function.
Think of something that comes 'before' ('pre-') a 'word' ('verb') — that's what a preverb does.