In a collusive manner; in a way that involves secret or dishonest coordination between parties.
Adverbial form of 'collusive,' formed by adding the '-ly' suffix, which converts adjectives into adverbs describing how an action is performed.
When a lawyer says two companies acted 'collusively,' they're saying the coordination was so suspiciously perfect that it couldn't be coincidence—it's the difference between competitors who happen to charge the same price and ones who secretly agreed to do so.
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