Synonyms:
connivance, collusion
Meaning: agreement on a secret plot
Usage examples
The connivance of Doctor Walker was suggested by his love for Louise.
Then, furious at her apparent connivance, he had started for the station.
The doubt that crept through my mind as to any possibility of connivance between her and Pickering was as vague and fleeting as the shadow of a swallow’s wing on a sunny meadow.
She sought Brandon upon all occasions, and made opportunities to meet him; not openly--at any rate, not with Brandon's knowledge, nor with any connivance on his part, but apparently caring little what he or any one else might see.