The teacher reprimanded the student for playing with his phone in class.

reprimanded 是动词 reprimand 的过去式，reprimand 的意思是"严厉责备、正式训斥"，通常指上级对下级或权威人士对违规行为的正式批评。这个词带有正式警告的含义，比普通批评（scold）更严肃。