See on Joh 4:32. In Mat 6:19, Mat 6:20, and there only, it is used in the sense of rust, that which eats or corrodes. Similarly, corrode is from rodo, to gnaw.
Him hath God the Father sealed
The Rev. makes the sentence culminate properly in God: “for Him the Father, even God, hath sealed.†According to the strict Greek order it is: for Him the Father sealed, even God. On sealed (ἐσφÏαÌγισεν) see on Joh 3:33. Wyc., betokened Him.