I. ˈblak-ˌbȯl transitive verb
Date: 1770
1. : to vote against ; especially : to exclude from membership by casting a negative vote
2.
a. : to exclude socially : ostracize
b. : boycott
II. noun
Date: 1777
1. : a small black ball for use as a negative vote in a ballot box
2. : an adverse vote especially against admitting someone to membership in an organization