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The ClueAdd to marginally? (8 letter answer)
NotesThe answer ANNOTATE is rarely seen, appearing only about once every 1000 puzzles.
Comment on, as in a margin
Explain, in a way
Furnish explanatory comment
Make critical comments
Make critical notes on
Make explanatory markings
Provide explanatory material
Write fuller explanations
Clutter up page margins
DefinitionANNOTATE as a verb:
1. (annotate, footnote) = add explanatory notes to or supply with critical comments; "The scholar annotated the early edition of a famous novel"
2. (gloss, comment, annotate) = provide interlinear explanations for words or phrases; "He annotated on what his teacher had written"