to assert your authority or make a firm decision
自分の権威を主張する、または断固とした決定を下す (jibun no ken i o shucho suru matawa danko to shita kettei o kudasu)
"When they asked for an extension, he decided to put his foot down and refuse."
"彼らが延長を求めたとき、彼は自分の権威を主張して拒否することにした。" (karera ga enchou o motometa toki kare wa jibun no ken i o shucho shite kyohi suru koto ni shita)
to be in a very difficult or challenging situation
to suddenly start crying
the complete experience a user has with a brand or product
to replace old things or ideas with new ones
to adjust to new conditions or circumstances
to stay out of trouble; to behave properly
