What is "uncinching"

Usage examples of "uncinching".

One of the stronger guards finally began to gather the makings for a fire, while another crabbed down the line of horses, doing little more than uncinching saddles and dragging them from the horses' backs.

One of the stronger guards finally began to gather the makings for a fire, while another crabbed down the line of horses, doing little more than uncinching saddles and dragging them from the horses’ backs.