Become or cause to become soft or liquid.
1Another shot was fired, and it zipped by close enough to unthaw her legs.
2On the cusp of blindness, I feared that the numbness in my legs masked tremendous pain, which warmth would soon unthaw.
3Only at a hearth where homeliness and cordiality united to unthaw his proud reserve could Godwin perchance have found the companionship he needed.
4Coming to Earth, meeting Adam, had unthawed the ice she'd been able to build up over the years.