a dry, rough protective crust that forms over a cut or wound during healing

mange or a similar skin disease in animals

a person who refuses to strike or join a trade union or who takes the place of a striking worker

become encrusted or covered with a scab or scabs

I had a cut on my arm that had scabbed over

the wound had barely begun to scab, let alone heal

refuse to strike or join a trade union, or take the place of a striking worker

two inspectors who scabbed on the last strike were out this week

scrounge

she tried to scab a fag off me