supplement
Transitive Verb[C/U] Both
pl: supplementspast: supplementedpp: supplementeding: supplementing
The word carries a sense of filling a gap or adding a missing piece to reach a desired standard. It suggests that the original object was functional but incomplete or insufficient on its own. This creates a feeling of enhancement rather than total replacement.
Countable when referring to a specific pill or a separate magazine insert. Uncountable when referring to the general act of adding extra material to a document or diet.