Invalidate or Disprove a Theory
This page is the CodyCross answer for the clue below from Photography, Group 2014, Puzzle 4 (Removable Pieces).
Question is: Invalidate or Disprove a Theory
and the answer is: DISCREDIT
Word Meaning:
DISCREDIT — (transitive) To harm the good reputation of (a person).
Definitions from Wiktionary.