to have the opposite result of what was intended
意図した結果とは逆の結果になる (itoshita kekka to wa gyaku no kekka ni naru)
"His plan backfired and made things worse."
"彼の計画は裏目に出て、状況が悪化しました。" (kare no keikaku wa urame ni dete, jōkyō ga akka shimashita)
a funny moment in a serious situation
to behave confidently and proudly
to improve your performance or effort
to discuss or move between ideas casually
to deliberately ignore or show disapproval toward someone
Refusing to answer a question