The term REACT TO A BAD PUN can be summarized by two crossword solutions: MOAN (4 letters) and WINCE (5 letters). Moaning is an expression of displeasure or pain, usually in response to something unpleasant. WINCE is a facial expression of discomfort or pain, often in response to something that has caused embarrassment or distress. Both of these reactions are common responses to a bad pun, as the listener may feel embarrassed or annoyed by the joke.