To cover with ice or a glacier
To erode with a glacier
To freeze
To make something hard or harder (tough, resistant to pressure).
To become or make (a person or thing) resistant or less sensitive.
To become or make (a consonant) more fortis; to (cause to) undergo fortition.
To strengthen.
To modify (a website or other system) to make it resistant to malicious attacks.
To unpalatalize or velarize.
To become hard (tough, resistant to pressure).