To gradually melt, dissolve, or become fluid; to soften from frozen
Example: "The ice thaws"
To become so warm as to melt ice and snow — said in reference to the weather, and used impersonally.
Example: "It's beginning to thaw."
To grow gentle or genial.
Example: "Her anger has thawed."
To gradually cause frozen things (such as earth, snow, ice) to melt, soften, or dissolve.