0 a person who works while others that they work with are on strike
1 an employee who continues to work during a strike (= a period when workers refuse to work because of a disagreement with an employer):
Moreover, though I am carefully informed that he is a blackleg, I find him honest.
He employs strike-breakers - "blacklegs" - during the dock dispute and distributes tobacco and alcohol in response to the blacklegs' demands.
What you really want, however, is protectors for blacklegs.
It is these blackleg stallions, so to speak, which are doing irreparable mischief to the horse breeding of the country.
In any case, we would like to know which one has been the blackleg who has gone without a salary.
It is the attempt to force them into blacklegging which has incensed the dockers today.
If they do not, they are considered to be blacklegs.