ob-

1. 1.

   A prefix signifying to, toward, before, against, reversely,；etc.; also, as a simple intensive; as in oblige, to bind to; obstacle,；something standing before; object, lit., to throw against; obovate,；reversely, ovate. Ob- is commonly assimilated before c, f, g, and p, to；oc-, of-, og-, and op-.

   表示“对；向

向