The term 'chiding sound' refers to a sound made to express disapproval or disappointment. The crossword solutions for this term are TUT (3 letters), TSKTSK (6 letters), TSK (3 letters), and TUTTUT (6 letters). TUT is a short, sharp sound made with the tongue, while TSKTSK and TSK are both sounds made with the tongue and teeth. TUTTUT is a combination of two TUT sounds. All of these sounds are used to express disapproval or disappointment.