The school was ruined by backbiters who always talked bad about others behind their backs.

backbiters 是名词 backbiter 的复数形式。backbiter 由动词 backbite（背后中伤）加后缀 -er 构成，指"在背后说人坏话的人"。 backbite 由 back（背后）和 bite（咬）组成，字面意思是"从背后咬人"，引申为"背后诽谤、中伤"。 backbiters 指那些喜欢在别人背后说坏话、散布谣言的人，即"诽谤者"或"背后中伤者"。