What is "untethering"

Usage examples of "untethering".

He walked slowly away from the cracking stones of the white wall toward the distant corner of the field where Fissar was untethering two mounts.

He made his way back to his rain-soaked mount, untethering it but not remounting just yet as he said, "I'm sorry about this too, pard.

He felt better about his means of transportation when, just as he was untethering his livery mount out front, the sun broke through and he declared, "I'll be damned if I don't believe it could be fixing to clear up.

He was bending to the task of untethering Harry to bring him to the cross when one of Blessedm’n Zury’s acolytes—a creature with a round, piebald face, and the bow-legged gait of a midget—rolled into view and picked up Bartho’s hammer.

The horses were stirring, nickering, shadows moving about them, untethering them.