1. forming a hard outer layer or surface
Usage: present participle of ‘crust’

1. the formation of a hard outer layer

Examples

• The bread was crusting nicely in the oven.
• Snow was crusting over in the freezing temperatures.
• The paint began crusting after sitting too long.
• Mud was crusting on his boots as it dried.
• The crusting of the pie took longer than expected.
• Ice crusting formed on the pond overnight.