Definitions:
of a colour at the end of the spectrum next to orange and opposite violet, as of blood, fire, or rubies

communist or socialist (used especially during the cold war with reference to the soviet union)

involving bloodshed or violence

(of a xhosa) coming from a traditional tribal culture

red colour or pigment

a red thing

a communist or socialist.

the situation of owing money to a bank or making a loss in a business operation