Mark Text for Emphasis
This page is the CodyCross answer for the clue below from All Things Water, Group 1283, Puzzle 5 (Amazon River).
Question is: Mark Text for Emphasis
and the answer is: UNDERLINE
Word Meaning:
UNDERLINE — A line placed underneath a piece of text in order to provide emphasis or to indicate that it should be viewed in italics or (in electronic documents) that it acts as a hyperlink.
Definitions from Wiktionary.