confederate
/kənˈfɛdəɹət/ noun C2- A member of a confederacy.
- An accomplice in a plot.
- An actor who participates in a psychological experiment pretending to be a subject but in actuality working for the researcher.
Plural confederates
From the library
Oberstein lived there with a single valet, who was probably a confederate entirely in his confidence.
A confederate who foresees your conclusions and course of action is always dangerous, but one to whom each development comes as a perpetual surprise, and to whom the future is always a closed book, is, indeed, an ideal helpmate.
It is something connected with the man he murdered—the man who may have been his confederate in crime.
A confederate—and even that one glance had told me how dangerous a man that confederate was—had kept guard while the Professor had attacked me.
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