1. (n.) The act of flowing or pouring back by the orifice of entrance

2. (n.) the reversal of the natural direction in which the current or contents flow through a tube or cavity of the body.

3. (n.) The act of swallowing again; reabsorption.

Charybdis Maelstrom back stream backflow backwash backwater barf countercurrent counterflow counterflux disgorgement doubling duplication echo eddy egesta egestion gagging gulf gurge heaves heaving imitation maelstrom nausea plagiarism puke quotation reappearance rebirth recurrence redoubling reduplication reecho refluence reflux reincarnation renewal reoccurrence repetition reproduction resumption return spew swirl twirl vomit vomiting vomition vortex whirl whirlpool