to seek justice personally rather than through legal authorities
自分で正義を行う; 法に頼らずに裁く (jibun de seigi o okonau; ho ni tayorazu ni sabaku)
"The villagers decided to take the law into their own hands and punished the thief."
"村人たちは自分たちで正義を行い、泥棒を罰した。" (murabito tachi wa jibun tachi de seigi o okonai dorobo o basshita)
the basic practical details of something
someone who attracts attention and stands out
directly involved in the most active or dangerous part of so...
working together leads to success
to start a computer or system
a moment when an important change happens