Ob-
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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-.
Ob- meaning & definition 1 of Ob-.
