on [through] the grapevine
うわさで
on the grounds that ...
…という根拠に基づいて
(every hour) on the half-hour
毎正時30分に(◇1:30,2:30など)
on the hour [the half hour]
毎時正時[30分]に
on the inside of a window
窓の内側に
on the international stage
国際舞台で
on the journey
旅の途中で
on the lam
(特に警察を避けて)逃走[潜伏]中で
on [off] the latch
掛け金をかけて[はずして]
on the leeward of ...
…の風下に