fraternizer
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frat·er·nize
(frăt′ər-nīz′)intr.v. frat·er·nized, frat·er·niz·ing, frat·er·niz·es
1. To associate with others in a brotherly or congenial way.
2. To associate on friendly terms with an enemy or opposing group, often in violation of discipline or orders.
[French fraterniser, from Medieval Latin frāternizāre, from Latin frāternus, fraternal; see fraternal.]
frat′er·ni·za′tion (-nĭ-zā′shən) n.
frat′er·niz′er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.