The term 'Sound of Reproach' is used to describe a sound or expression that conveys disapproval or disappointment. The two crossword solutions for this term are TUT and TSK. TUT is an interjection used to express disapproval, while TSK is an interjection used to express annoyance, disappointment, or disapproval. Both of these sounds are often used to express disapproval or disappointment in a situation.