Definitions:
of the very darkest colour owing to the absence of or complete absorption of light; the opposite of white

belonging to or denoting a human group having dark-coloured skin, especially of sub-saharan african ancestry.

characterized by tragic or disastrous events; causing despair or pessimism

denoting a covert military procedure

(of goods or work) not to be handled or undertaken by trade union members, especially so as to express support for an industrial dispute elsewhere

black colour or pigment

the situation of not owing money to a bank or of making a profit in a business operation

a member of a human group having dark-coloured skin, especially one of sub-saharan african ancestry.

make (something) black; blacken

refuse to handle (goods), undertake (work), or have dealings with (a person or business) as a way of taking industrial action