to attend a meeting or class without participating actively
積極的に参加せずに会議や授業に参加する (sekkyokuteki ni sankasezu ni kaigi ya jugyo ni sankasuru)
"He was allowed to sit in on the meeting as an observer."
"彼は観察者として会議に参加することが許可されました。" (Kare wa kansatsusha toshite kaigi ni sankasuru koto ga kyoka saremashita)
to reduce conflict or hostility between countries
to feel sad or disappointed about something that happened
to suppress or hide emotions deeply inside
to trade directly without using intermediaries
to become full or crowded with something
to remain in the same place and wait
