I am almost sure there is a proper name for that but I forgot. It would be the opposite of semantic bleaching...
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5There's probably at least nine processes, depending on who is categorising them! – curiousdannii Jun 27 at 7:50
You could be referring to semantic change or more specifically semantic expansion (as described here: https://www.uni-due.de/SHE/SHE_Change_Semantic.htm#types ), depending on what type of change it is, there is then more specific terms.
