to substitute for someone temporarily
誰かを一時的に代わりにする (dareka o ichijiteki ni kawari ni suru)
"The assistant will sit in for the teacher today."
"今日はアシスタントがシットインフォー教師を担当します。" (Kyou wa ashisutanto ga **shitto in foo** kyoushi o tantou shimasu.)
to focus your mind completely on peace and relaxation
to prevent the market from collapsing or declining
to demonstrate that you value something
to resist or oppose injustice; to defend principles
to reintroduce or restore something that was removed
to offer or provide food or a meal
