Mutual coordination of internal and external secret to achieve some purpose.
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Thesaurus
Destroy eyebrow bow, subservient, worship things foreign and fawn on foreign countries, Traitorous glory, barter away one's honor for sb.'s patronage, maintain illicit relations with a foreign country, Fawn on foreign powers Glory, Ungrateful, collaborate from within with forces from without, act from inside in coordination with forces attacking from outside, take the foe for one’ s father, Identify the enemy make a companion of, humiliate the nation and forfeit its sovereignty; surrender a country's sovereign rights under humiliating terms, act from inside in coordination with attack from outside
Antonym
die for one's country, Inch of loyalty, A loyalty, Obsessions forget home, goodness of heart, blood shed in a just cause a loyal heart, the innocence of childhood, sincere loyalty dedicate oneself to the service of one's country, Liver and gall According to people, Dedicated allegiance, Dedicated my heart