An accomplice in a plot.
A member of a confederacy.
An actor who participates in a psychological experiment pretending to be a subject but in actuality working for the researcher.
of, relating to, or united in a confederacy
banded together; allied.
To combine in a confederacy.
A friend, buddy, mate, cobber; someone to hang around with.
An informal term of address, often used ironically in a hostile way.
Be friends with, hang around with.