Definitions
1.verbTo treat or deal with (a topic) again or differently.
2.verbTo apply treatment to (an injury, a surface, etc.) again
3.verbTo withdraw from a position, go back.
4.verb(of a glacier) To shrink back due to generally warmer temperatures.
5.verbTo slope back."a retreating forehead"
6.nounThe act of moving back from something; a retreat.