pilling up

Verb

pill up (third-person singular simple present pills up, present participle pilling up, simple past and past participle pilled up)

1. (intransitive) To become thoroughly pilled (to form small matted balls of fiber).
2. (intransitive) To flake off the skin.
3. (intransitive) To use drugs in pill form (a small, usually round or cylindrical object designed for easy swallowing, usually containing some sort of medication).