connive at (something)
To plot or conspire about something. What are you kids whispering about back there? You better not be conniving at something!
connive at something (with someone)
and connive (at something) with someoneto scheme at something (with someone); to plot something (with someone). Are you conniving at something with Ronald? Are you and Ronald conniving with Tom at something I should know about? Stop conniving with people!