Walk Back Meaning

(transitive) To withdraw or back-pedal on a statement or promise; retract.

Example: Used other than as an idiom: see walk,‎ back.
2010, Greg Sargent, The Plumb Line:
  Did Obama walk back his support of Cordoba House? As you know, the Internets are alive with the claim that Obama has now walked back his support of Cordoba House, and I've gotten tons of emails telling me that my earlier praise of the speech is no longer operative. But did he really walk back what he said last night?