To Scab

1. (intransitive) To become covered by a scab or scabs.
2. (intransitive) To form into scabs and be shed, as damaged or diseased skin.
3. (transitive) To remove part of a surface (from).
4. (intransitive) To act as a strikebreaker.
5. (transitive, Britain, Australia, New Zealand,informal) To beg (for), to cadge or bum.