Set in Motion, Start a Reaction
This page is the CodyCross answer for the clue below from Cosmetology, Group 1774, Puzzle 1 (Heat Protectant).
Question is: Set in Motion, Start a Reaction
and the answer is: ACTIVATE
Word Meaning:
ACTIVATE — (transitive) To encourage development or induce increased activity; to stimulate.
Definitions from Wiktionary.