“No chickening out!”

The answer to the crossword question “‘No chickening out!’ is ‘DOIT’” is a play on words. The phrase “‘No chickening out!’” is an exclamation used to urge someone to stop being scared or hesitant and take action. The words “do it” sound similar to “chickening out” and serve as a clever wordplay. Therefore, the answer to the crossword clue is “‘DOIT’,” which is a combination of the words “do” and “it” and can be seen as an encouragement to take action and not give up.