vicious circle
noun [ S ] uk/ˌvɪʃ.əs ˈsɜː.kəl/ us/ˌvɪʃ.əs ˈsɝː.kəl/
恶性循环
a continuing unpleasant situation, created when one problem causes another problem that then makes the first problem worse
Many people get caught/trapped in a vicious circle of dieting and weight gain. 很多人都陷入节食减肥而后又体重增加的恶性循环之中。